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Videos uploaded by user “kudvenkat”
Part 33 - C# Tutorial - Difference between abstract classes and interfaces.avi
 
05:15
Text version of the video http://csharp-video-tutorials.blogspot.com/2012/06/part-33-c-tutorial-difference-between.html Slides http://csharp-video-tutorials.blogspot.com/2013/08/part-33-abstract-classes-vs-interfaces.html All C# Text Articles http://csharp-video-tutorials.blogspot.co.uk/p/free-c-video-tutorial-for-beginners.html All C# Slides http://csharp-video-tutorials.blogspot.com/p/c.html Complete C# tutorial https://www.youtube.com/playlist?list=PLAC325451207E3105 All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists In this part of the c sharp tutorial we will learn about the differences between abstract classes and interfaces
Views: 355427 kudvenkat
Part 36 - C# Tutorial - Delegates in c#.avi
 
11:54
In this c sharp tutorial we will learn the basics of delegates Text version of the video http://csharp-video-tutorials.blogspot.com/2012/06/part-36-c-tutorial-delegates.html Slides http://csharp-video-tutorials.blogspot.com/2013/08/part-36-delegates.html All C# Text Articles http://csharp-video-tutorials.blogspot.co.uk/p/free-c-video-tutorial-for-beginners.html All C# Slides http://csharp-video-tutorials.blogspot.com/p/c.html Complete C# tutorial https://www.youtube.com/playlist?list=PLAC325451207E3105 All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 435516 kudvenkat
Cross apply and outer apply in sql server
 
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cross apply sql server example sql server outer apply example sql server join table function with parameter sql server inner join table valued function In this video we will discuss cross apply and outer apply in sql server with examples. We want to retrieve all the matching rows between Department and Employee tables. This can be very easily achieved using an Inner Join as shown below. Select D.DepartmentName, E.Name, E.Gender, E.Salary from Department D Inner Join Employee E On D.Id = E.DepartmentId Now if we want to retrieve all the matching rows between Department and Employee tables + the non-matching rows from the LEFT table (Department) This can be very easily achieved using a Left Join as shown below. Select D.DepartmentName, E.Name, E.Gender, E.Salary from Department D Left Join Employee E On D.Id = E.DepartmentId Now let's assume we do not have access to the Employee table. Instead we have access to the following Table Valued function, that returns all employees belonging to a department by Department Id. Create function fn_GetEmployeesByDepartmentId(@DepartmentId int) Returns Table as Return ( Select Id, Name, Gender, Salary, DepartmentId from Employee where DepartmentId = @DepartmentId ) Go The following query returns the employees of the department with Id =1. Select * from fn_GetEmployeesByDepartmentId(1) Now if you try to perform an Inner or Left join between Department table and fn_GetEmployeesByDepartmentId() function you will get an error. Select D.DepartmentName, E.Name, E.Gender, E.Salary from Department D Inner Join fn_GetEmployeesByDepartmentId(D.Id) E On D.Id = E.DepartmentId If you execute the above query you will get the following error Msg 4104, Level 16, State 1, Line 3 The multi-part identifier "D.Id" could not be bound. This is where we use Cross Apply and Outer Apply operators. Cross Apply is semantically equivalent to Inner Join and Outer Apply is semantically equivalent to Left Outer Join. Just like Inner Join, Cross Apply retrieves only the matching rows from the Department table and fn_GetEmployeesByDepartmentId() table valued function. Select D.DepartmentName, E.Name, E.Gender, E.Salary from Department D Cross Apply fn_GetEmployeesByDepartmentId(D.Id) E Just like Left Outer Join, Outer Apply retrieves all matching rows from the Department table and fn_GetEmployeesByDepartmentId() table valued function + non-matching rows from the left table (Department) Select D.DepartmentName, E.Name, E.Gender, E.Salary from Department D Outer Apply fn_GetEmployeesByDepartmentId(D.Id) E How does Cross Apply and Outer Apply work The APPLY operator introduced in SQL Server 2005, is used to join a table to a table-valued function. The Table Valued Function on the right hand side of the APPLY operator gets called for each row from the left (also called outer table) table. Cross Apply returns only matching rows (semantically equivalent to Inner Join) Outer Apply returns matching + non-matching rows (semantically equivalent to Left Outer Join). The unmatched columns of the table valued function will be set to NULL. Text version of the video http://csharp-video-tutorials.blogspot.com/2015/09/cross-apply-and-outer-apply-in-sql.html Slides http://csharp-video-tutorials.blogspot.com/2015/09/cross-apply-and-outer-apply-in-sql_8.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 85191 kudvenkat
Part 4   Delete duplicate rows in sql
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2014/05/part-4-delete-duplicate-rows-in-sql.html In this video, we will discuss deleting all duplicate rows except one from a sql server table. SQL Script to create Employees table Create table Employees ( ID int, FirstName nvarchar(50), LastName nvarchar(50), Gender nvarchar(50), Salary int ) GO Insert into Employees values (1, 'Mark', 'Hastings', 'Male', 60000) Insert into Employees values (1, 'Mark', 'Hastings', 'Male', 60000) Insert into Employees values (1, 'Mark', 'Hastings', 'Male', 60000) Insert into Employees values (2, 'Mary', 'Lambeth', 'Female', 30000) Insert into Employees values (2, 'Mary', 'Lambeth', 'Female', 30000) Insert into Employees values (3, 'Ben', 'Hoskins', 'Male', 70000) Insert into Employees values (3, 'Ben', 'Hoskins', 'Male', 70000) Insert into Employees values (3, 'Ben', 'Hoskins', 'Male', 70000) The delete query should delete all duplicate rows except one. Here is the SQL query that does the job. PARTITION BY divides the query result set into partitions. WITH EmployeesCTE AS ( SELECT *, ROW_NUMBER()OVER(PARTITION BY ID ORDER BY ID) AS RowNumber FROM Employees ) DELETE FROM EmployeesCTE WHERE RowNumber ] 1
Views: 381784 kudvenkat
Indexes in sql server   Part 35
 
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In this video we will learn about What are indexes Why do we use indexes Advantages of indexes These concepts are applicable to sql server 2000, 2005 and 2008 Text version of the video http://csharp-video-tutorials.blogspot.com/2012/09/indexes-in-sql-server-part-35.html Slides http://csharp-video-tutorials.blogspot.com/2013/08/part-35-indexes.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 431329 kudvenkat
Part 53   Difference between html.partial and html.renderpartial
 
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Link for code samples used in the demo http://csharp-video-tutorials.blogspot.com/2013/07/part-53-difference-between-htmlpartial.html Link for csharp, asp.net, ado.net, dotnet basics, mvc and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists In this video, we will discuss the difference between Partial() and RenderPartial() html helper methods. Both of these helper methods are used for rendering partial views. Differences: 1. The return type of "RenderPartial" is void, where as "Partial" returns "MvcHtmlString" 2. Syntax for invoking Partial() and RenderPartial() methods in Razor views @Html.Partial("PartialViewName") @{ Html.RenderPartial("PartialViewName"); } 3. Syntax for invoking Partial() and RenderPartial() methods in webform views [%: Html.Partial("PartialViewName") %] [% Html.RenderPartial("PartialViewName"); %] The following are the 2 common interview questions related to Partial() and RenderPartial() When would you use Partial() over RenderPartial() and vice versa? The main difference is that "RenderPartial()" returns void and the output will be written directly to the output stream, where as the "Partial()" method returns MvcHtmlString, which can be assigned to a variable and manipulate it if required. So, when there is a need to assign the output to a variable for manipulating it, then use Partial(), else use RenderPartial(). Which one is better for performance? From a performance perspective, rendering directly to the output stream is better. RenderPartial() does exactly the same thing and is better for performance over Partial(). Note: Make sure to replace [ with LESSTHAN and ] with GREATERTHAN symbol.
Views: 125586 kudvenkat
Part 6  ViewData and ViewBag in mvc
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2013/04/part-6-viewdata-and-viewbag-in-mvc.html Slides http://csharp-video-tutorials.blogspot.com/2013/09/part-6-view-data-and-view-bag-in-mvc.html All ASP .NET MVC Text Articles http://csharp-video-tutorials.blogspot.com/p/aspnet-mvc-tutorial-for-beginners.html All ASP .NET MVC Slides http://csharp-video-tutorials.blogspot.com/p/aspnet-mvc-slides.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists In this video we will discuss 1. What is ViewData 2. What is ViewBag 3. Difference between ViewData and ViewBag Both ViewData and ViewBag are used to pass data from a controller to a view. ViewData is a dictionary of objects that are stored and retrieved using strings as keys. The syntax of ViewData is very similar to that of ViewState, SessionState and ApplicationState. // Storing data in ViewData ViewData["YourData"] = "SomeData"; // Retrieving data from ViewData string strData = ViewData["YourData"].ToString(); ViewData does not provide compile time error checking. For example, if you mis-spell the key names you wouldn't get any compile time error. You get to know about the error only at runtime. ViewBag uses the dynamic feature that was introduced in to C# 4. It allows an object to have properties dynamically added to it. Using ViewBag the above code can be rewritten as below. // Storing data in ViewBag ViewBag.YourData = "SomeData"; // Retrieving data from ViewBag string strData = ViewBag.YourData; Just like ViewData, ViewBag does not provide compile time error checking. For example, if you mis-spell the property name, you wouldn't get any compile time error. You get to know about the error only at runtime. Internally ViewBag properties are stored as name/value pairs in the ViewData dictionary. Please Note: To pass data from controller to a view, It's always a good practice to use strongly typed view models instead of using ViewBag & ViewData. Strongly typed view models provide compile time error checking. We will discuss view models in a later video session.
Views: 480037 kudvenkat
Over clause in SQL Server
 
09:13
over partition by in sql server 2008 sql server over clause partition partition by clause in sql server 2008 over partition by clause in sql In this video we will discuss the power and use of Over clause in SQL Server. The OVER clause combined with PARTITION BY is used to break up data into partitions. Syntax : function (...) OVER (PARTITION BY col1, Col2, ...) The specified function operates for each partition. For example : COUNT(Gender) OVER (PARTITION BY Gender) will partition the data by GENDER i.e there will 2 partitions (Male and Female) and then the COUNT() function is applied over each partition. Any of the following functions can be used. Please note this is not the complete list. COUNT(), AVG(), SUM(), MIN(), MAX(), ROW_NUMBER(), RANK(), DENSE_RANK() etc. Example : SQl Script to create Employees table Create Table Employees ( Id int primary key, Name nvarchar(50), Gender nvarchar(10), Salary int ) Go Insert Into Employees Values (1, 'Mark', 'Male', 5000) Insert Into Employees Values (2, 'John', 'Male', 4500) Insert Into Employees Values (3, 'Pam', 'Female', 5500) Insert Into Employees Values (4, 'Sara', 'Female', 4000) Insert Into Employees Values (5, 'Todd', 'Male', 3500) Insert Into Employees Values (6, 'Mary', 'Female', 5000) Insert Into Employees Values (7, 'Ben', 'Male', 6500) Insert Into Employees Values (8, 'Jodi', 'Female', 7000) Insert Into Employees Values (9, 'Tom', 'Male', 5500) Insert Into Employees Values (10, 'Ron', 'Male', 5000) Go Write a query to retrieve total count of employees by Gender. Also in the result we want Average, Minimum and Maximum salary by Gender. This can be very easily achieved using a simple GROUP BY query as show below. SELECT Gender, COUNT(*) AS GenderTotal, AVG(Salary) AS AvgSal, MIN(Salary) AS MinSal, MAX(Salary) AS MaxSal FROM Employees GROUP BY Gender What if we want non-aggregated values (like employee Name and Salary) in result set along with aggregated values You cannot include non-aggregated columns in the GROUP BY query. SELECT Name, Salary, Gender, COUNT(*) AS GenderTotal, AVG(Salary) AS AvgSal, MIN(Salary) AS MinSal, MAX(Salary) AS MaxSal FROM Employees GROUP BY Gender The above query will result in the following error : Column 'Employees.Name' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause One way to achieve this is by including the aggregations in a subquery and then JOINING it with the main query as shown in the example below. Look at the amount of T-SQL code we have to write. SELECT Name, Salary, Employees.Gender, Genders.GenderTotals, Genders.AvgSal, Genders.MinSal, Genders.MaxSal FROM Employees INNER JOIN (SELECT Gender, COUNT(*) AS GenderTotals, AVG(Salary) AS AvgSal, MIN(Salary) AS MinSal, MAX(Salary) AS MaxSal FROM Employees GROUP BY Gender) AS Genders ON Genders.Gender = Employees.Gender Better way of doing this is by using the OVER clause combined with PARTITION BY SELECT Name, Salary, Gender, COUNT(Gender) OVER(PARTITION BY Gender) AS GenderTotals, AVG(Salary) OVER(PARTITION BY Gender) AS AvgSal, MIN(Salary) OVER(PARTITION BY Gender) AS MinSal, MAX(Salary) OVER(PARTITION BY Gender) AS MaxSal FROM Employees Text version of the video http://csharp-video-tutorials.blogspot.com/2015/09/over-clause-in-sql-server.html Slides http://csharp-video-tutorials.blogspot.com/2015/09/over-clause-in-sql-server_29.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 99978 kudvenkat
Part 24 - C# Tutorial - Difference between method overriding and method hiding.avi
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2012/06/part-24-c-tutorial-difference-between.html Slides http://csharp-video-tutorials.blogspot.com/2013/08/part-24-method-overriding-vs-method.html All C# Text Articles http://csharp-video-tutorials.blogspot.co.uk/p/free-c-video-tutorial-for-beginners.html All C# Slides http://csharp-video-tutorials.blogspot.com/p/c.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists In this part of the c sharp tutorial we will learn the difference between method overriding and method hiding
Views: 282246 kudvenkat
Clustered and nonclustered indexes in sql server   Part 36
 
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In this video we will learn about 1. Different types of indexes in sql server 2. What are clustered indexes 3. What are NonClustered indexes 4. Difference between clustered and non clustered indexes Text version of the video http://csharp-video-tutorials.blogspot.co.uk/2012/09/clustered-and-non-clustered-indexes.html Slides http://csharp-video-tutorials.blogspot.com/2013/09/part-36-clustered-nonclustered-indexes.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 520431 kudvenkat
Lead and Lag functions in SQL Server 2012
 
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In this video we will discuss about Lead and Lag functions. Lead and Lag functions Introduced in SQL Server 2012 Lead function is used to access subsequent row data along with current row data Lag function is used to access previous row data along with current row data ORDER BY clause is required PARTITION BY clause is optional Syntax LEAD(Column_Name, Offset, Default_Value) OVER (ORDER BY Col1, Col2, ...) LAG(Column_Name, Offset, Default_Value) OVER (ORDER BY Col1, Col2, ...) Offset - Number of rows to lead or lag. Default_Value - The default value to return if the number of rows to lead or lag goes beyond first row or last row in a table or partition. If default value is not specified NULL is returned. We will use the following Employees table for the examples in this video SQL Script to create the Employees table Create Table Employees ( Id int primary key, Name nvarchar(50), Gender nvarchar(10), Salary int ) Go Insert Into Employees Values (1, 'Mark', 'Male', 1000) Insert Into Employees Values (2, 'John', 'Male', 2000) Insert Into Employees Values (3, 'Pam', 'Female', 3000) Insert Into Employees Values (4, 'Sara', 'Female', 4000) Insert Into Employees Values (5, 'Todd', 'Male', 5000) Insert Into Employees Values (6, 'Mary', 'Female', 6000) Insert Into Employees Values (7, 'Ben', 'Male', 7000) Insert Into Employees Values (8, 'Jodi', 'Female', 8000) Insert Into Employees Values (9, 'Tom', 'Male', 9000) Insert Into Employees Values (10, 'Ron', 'Male', 9500) Go Lead and Lag functions example WITHOUT partitions : This example Leads 2 rows and Lags 1 row from the current row. When you are on the first row, LEAD(Salary, 2, -1) allows you to move forward 2 rows and retrieve the salary from the 3rd row. When you are on the first row, LAG(Salary, 1, -1) allows us to move backward 1 row. Since there no rows beyond row 1, Lag function in this case returns the default value -1. When you are on the last row, LEAD(Salary, 2, -1) allows you to move forward 2 rows. Since there no rows beyond the last row 1, Lead function in this case returns the default value -1. When you are on the last row, LAG(Salary, 1, -1) allows us to move backward 1 row and retrieve the salary from the previous row. SELECT Name, Gender, Salary, LEAD(Salary, 2, -1) OVER (ORDER BY Salary) AS Lead_2, LAG(Salary, 1, -1) OVER (ORDER BY Salary) AS Lag_1 FROM Employees Lead and Lag functions example WITH partitions : Notice that in this example, Lead and Lag functions return default value if the number of rows to lead or lag goes beyond first row or last row in the partition. SELECT Name, Gender, Salary, LEAD(Salary, 2, -1) OVER (PARTITION By Gender ORDER BY Salary) AS Lead_2, LAG(Salary, 1, -1) OVER (PARTITION By Gender ORDER BY Salary) AS Lag_1 FROM Employees Text version of the video http://csharp-video-tutorials.blogspot.com/2015/10/lead-and-lag-functions-in-sql-server.html Slides http://csharp-video-tutorials.blogspot.com/2015/10/lead-and-lag-functions-in-sql-server_5.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 57537 kudvenkat
Database normalization   Part 52
 
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In this video we will learn about, database normalization, different normal forms, problems of data redundancy, first normal form, that is how to put a table in 1 NF. Text version of the video http://csharp-video-tutorials.blogspot.com/2012/09/database-normalization-part-52.html Slides http://csharp-video-tutorials.blogspot.com/2013/09/part-52-normalization.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 200414 kudvenkat
Difference between where and having in sql server
 
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sql server where vs having sql server group by where having group by having sql server In this vide we will discuss the difference between where and having caluses in sql server. Let us understand the difference with an example. To calculate total sales by product, we would write a GROUP BY query as shown below SELECT Product, SUM(SaleAmount) AS TotalSales FROM Sales GROUP BY Product Now if we want to find only those products where the total sales amount is greater than $1000, we will use HAVING clause to filter products SELECT Product, SUM(SaleAmount) AS TotalSales FROM Sales GROUP BY Product HAVING SUM(SaleAmount) ] 1000 If we use WHERE clause instead of HAVING clause, we will get a syntax error. This is because the WHERE clause doesn’t work with aggregate functions like sum, min, max, avg, etc. SELECT Product, SUM(SaleAmount) AS TotalSales FROM Sales GROUP BY Product WHERE SUM(SaleAmount) ] 1000 So in short, the difference is WHERE clause cannot be used with aggregates where as HAVING can. However, there are other differences as well that we need to keep in mind when using WHERE and HAVING clauses. WHERE clause filters rows before aggregate calculations are performed where as HAVING clause filters rows after aggregate calculations are performed. Let us understand this with an example. Total sales of iPhone and Speakers can be calculated by using either WHERE or HAVING clause Calculate Total sales of iPhone and Speakers using WHERE clause : In this example the WHERE clause retrieves only iPhone and Speaker products and then performs the sum. SELECT Product, SUM(SaleAmount) AS TotalSales FROM Sales WHERE Product in ('iPhone', 'Speakers') GROUP BY Product Calculate Total sales of iPhone and Speakers using HAVING clause : This example retrieves all rows from Sales table, performs the sum and then removes all products except iPhone and Speakers. SELECT Product, SUM(SaleAmount) AS TotalSales FROM Sales GROUP BY Product HAVING Product in ('iPhone', 'Speakers') So from a performance standpoint, HAVING is slower than WHERE and should be avoided when possible. Another difference is WHERE comes before GROUP BY and HAVING comes after GROUP BY. Difference between WHERE and Having 1. WHERE clause cannot be used with aggregates where as HAVING can. This means WHERE clause is used for filtering individual rows where as HAVING clause is used to filter groups. 2. WHERE comes before GROUP BY. This means WHERE clause filters rows before aggregate calculations are performed. HAVING comes after GROUP BY. This means HAVING clause filters rows after aggregate calculations are performed. So from a performance standpoint, HAVING is slower than WHERE and should be avoided when possible. 3. WHERE and HAVING can be used together in a SELECT query. In this case WHERE clause is applied first to filter individual rows. The rows are then grouped and aggregate calculations are performed, and then the HAVING clause filters the groups. Text version of the video http://csharp-video-tutorials.blogspot.com/2015/09/difference-between-where-and-having-in.html Slides http://csharp-video-tutorials.blogspot.com/2015/09/difference-between-where-and-having-in_15.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html Full SQL Server Course https://www.youtube.com/playlist?list=PL4cyC4G0M1RQ_Rm52cQ4CcOJ_T_HXeMB4 All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 77681 kudvenkat
Part 1   Introduction to WCF
 
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Link for code samples used in the demo http://csharp-video-tutorials.blogspot.com/2013/11/part-1-introduction-to-wcf.html Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists In this video we will discuss What is WCF Why should we use WCF What is WCF? WCF stands for Windows Communication Foundation and is part of .NET 3.0. WCF is Microsoft platform for building distributed and interoperable applications. What is a distributed application? In simple terms a distributed application, is an application where parts of it run on 2 or more computers. Distributed applications are also called as connected systems or applications. Examples: A web application running on one machine and a web service that this application is consuming is running on another machine. An enterprise web application may have the following tiers, and each tier may be running on a different machine 1. Presentation tier 2. Business tier 3. Data Access tier Why build distributed applications? There are several reasons for this 1. An enterprise application may need to use the services provided by other enterprises. For example an ecommerce application may be using paypal service for payments. 2. For better scalability. An enterprise web application may have Presentation tier, Business tier, and Data Access tiert, and each tier may be running on a different machine. What is an interoperable application? An application that can communicate with any other application that is built on any platform and using any programming language is called as an interoperable application. Web services are interoperable, where as .NET remoting services are not. Web services can communicate with any application built on any platform, where as a .NET remoting service can be consumed only by a .net application. What technology choices did we have before WCF to build distributed applications? Enterprise Services Dot Net Remoting Web Services Why should we use WCF? Let's take this scenario We have 2 clients and we need to implement a service a for them. 1. The first client is using a Java application to interact with our service, so for interoperability this client wants messages to be in XML format and the protocol to be HTTP. 2. The second client uses .NET, so for better performance this client wants messages formmated in binary over TCP protocol. Without WCF 1. To satisfy the first client requirement we end up implementing an ASMX web service, and 2. To satisfy the second client requirement we end up implementing a remoting service These are 2 different technologies, and have complete different programming models. So the developers have to learn different technologies. So to unify and bring all these technologies under one roof Microsoft has come up with a single programming model that is called as WCF - Windows Communication Foundation. With WCF, You implement one service and we can configure as many end points as want to support all the client needs. To support the above 2 client requirements, we would configure 2 end points. In the endpoint configuration we can specify the protocols and message formats that we want to use. In Part 2, we will discuss implementing 1. A web service to exchange messages in XML format using HTTP protocol for interoperability. 2. A remoting service to exchange messages in binary format using TCP protocol for performance. Along the way, we will get a feel of how different these technologies are. In Part 3, we will dicuss implementing a single WCF Service and configuring different end points to support different transport protocols and message formats.
Views: 801807 kudvenkat
Part 3   Why and when should we use an abstract class
 
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Link for code samples used in the demo http://csharp-video-tutorials.blogspot.com/2013/09/part-3-why-and-when-should-we-use.html Link for csharp, asp.net, ado.net, dotnet basics, mvc and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists This question can also be asked in a slightly different way Give an example of where we could use an abstract class? Let us understand when to use an abstract class with an example. An organisation has 2 types of employees 1. FullTimeEmployee 2. ContractEmployee We would create an abstract class, when want to move the common functionality of 2 or more related classes into a base class and when, we don't want that base class to be instantiated.
Views: 598229 kudvenkat
Rank and Dense Rank in SQL Server
 
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rank and dense_rank example difference between rank and dense_rank with example rank vs dense_rank in sql server 2008 sql server difference between rank and dense_rank In this video we will discuss Rank and Dense_Rank functions in SQL Server Rank and Dense_Rank functions Introduced in SQL Server 2005 Returns a rank starting at 1 based on the ordering of rows imposed by the ORDER BY clause ORDER BY clause is required PARTITION BY clause is optional When the data is partitioned, rank is reset to 1 when the partition changes Difference between Rank and Dense_Rank functions Rank function skips ranking(s) if there is a tie where as Dense_Rank will not. For example : If you have 2 rows at rank 1 and you have 5 rows in total. RANK() returns - 1, 1, 3, 4, 5 DENSE_RANK returns - 1, 1, 2, 3, 4 Syntax : RANK() OVER (ORDER BY Col1, Col2, ...) DENSE_RANK() OVER (ORDER BY Col1, Col2, ...) RANK() and DENSE_RANK() functions without PARTITION BY clause : In this example, data is not partitioned, so RANK() function provides a consecutive numbering except when there is a tie. Rank 2 is skipped as there are 2 rows at rank 1. The third row gets rank 3. DENSE_RANK() on the other hand will not skip ranks if there is a tie. The first 2 rows get rank 1. Third row gets rank 2. SELECT Name, Salary, Gender, RANK() OVER (ORDER BY Salary DESC) AS [Rank], DENSE_RANK() OVER (ORDER BY Salary DESC) AS DenseRank FROM Employees RANK() and DENSE_RANK() functions with PARTITION BY clause : Notice when the partition changes from Female to Male Rank is reset to 1 SELECT Name, Salary, Gender, RANK() OVER (PARTITION BY Gender ORDER BY Salary DESC) AS [Rank], DENSE_RANK() OVER (PARTITION BY Gender ORDER BY Salary DESC) AS DenseRank FROM Employees Use case for RANK and DENSE_RANK functions : Both these functions can be used to find Nth highest salary. However, which function to use depends on what you want to do when there is a tie. Let me explain with an example. If there are 2 employees with the FIRST highest salary, there are 2 different business cases 1. If your business case is, not to produce any result for the SECOND highest salary, then use RANK function 2. If your business case is to return the next Salary after the tied rows as the SECOND highest Salary, then use DENSE_RANK function Since we have 2 Employees with the FIRST highest salary. Rank() function will not return any rows for the SECOND highest Salary. WITH Result AS ( SELECT Salary, RANK() OVER (ORDER BY Salary DESC) AS Salary_Rank FROM Employees ) SELECT TOP 1 Salary FROM Result WHERE Salary_Rank = 2 Though we have 2 Employees with the FIRST highest salary. Dense_Rank() function returns, the next Salary after the tied rows as the SECOND highest Salary WITH Result AS ( SELECT Salary, DENSE_RANK() OVER (ORDER BY Salary DESC) AS Salary_Rank FROM Employees ) SELECT TOP 1 Salary FROM Result WHERE Salary_Rank = 2 You can also use RANK and DENSE_RANK functions to find the Nth highest Salary among Male or Female employee groups. The following query finds the 3rd highest salary amount paid among the Female employees group WITH Result AS ( SELECT Salary, Gender, DENSE_RANK() OVER (PARTITION BY Gender ORDER BY Salary DESC) AS Salary_Rank FROM Employees ) SELECT TOP 1 Salary FROM Result WHERE Salary_Rank = 3 AND Gender = 'Female' Text version of the video http://csharp-video-tutorials.blogspot.com/2015/10/rank-and-denserank-in-sql-server.html Slides http://csharp-video-tutorials.blogspot.com/2015/10/rank-and-denserank-in-sql-server_1.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 88376 kudvenkat
Part 9   Call an abstract method from an abstract class constructor
 
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Link for code samples used in the demo http://csharp-video-tutorials.blogspot.com/2013/10/part-9-call-abstract-method-from.html Link for csharp, asp.net, ado.net, dotnet basics, mvc and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Can you call an abstract method from an abstract class constructor? If so, what is the use of it? Yes, an abstract method can be called from an abstract class constructor. Here is an example. public class Program { public static void Main() { CorporateCustomer CC = new CorporateCustomer(); SavingsCustomer SC = new SavingsCustomer(); } } public abstract class Customer { protected Customer() { Print(); } public abstract void Print(); } public class CorporateCustomer : Customer { public override void Print() { Console.WriteLine("CorporateCustomer Print() method implementation called"); } } public class SavingsCustomer : Customer { public override void Print() { Console.WriteLine("SavingsCustomer Print() method implementation called"); } } An abstract method in an abstract class does not have any implementation, so what is the use of calling it from the abstract class constructor? If you want the abstract method to be invoked automatically whenever an instance of the class that is derived from the abstract class is created, then we would call it in the constructor of the abstract class.
Views: 94737 kudvenkat
What is bootstrap
 
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twitter bootstrap tutorial for beginners twitter bootstrap for beginners benefits of bootstrap framework advantages of bootstrap framework twitter bootstrap benefits what is responsive web design what is responsive website what is responsive design use of bootstrap responsive web development responsive web app In this video we will discuss 1. What is bootstrap 2. Advantages of using bootstrap Bootstrap is a free, open-source and is the most popular HTML, CSS, and JavaScript framework developed by twitter for creating responsive web applications. It includes HTML and CSS based design templates for common user interface components like Buttons, Dropdowns, Typography, Tabs, Forms, Tables, Navigations, Alerts, Modals, Accordion, Carousel etc. along with optional JavaScript extensions. Bootstrap framework is based on open standards - HTML, CSS and JavaScript. This means bootstrap can be used with any server side technology and any platform. You can use it with any web application built with any server side technology like ASP.NET, JAVA, PHP etc. What are the advantages of using bootstrap Supports responsive design : One of the greatest advantages of using bootstrap is that it helps us create responsive web applications faster and easier. So the obvious question that comes to our mind is, what is a responsive web application? A responsive web application automatically adapts to different screen sizes (i.e desktop computers, laptops, tablets. mobile phones etc). A responsive application provides optimal viewing and interaction experience i.e easy reading and navigation with a minimum of resizing, panning, and scrolling across a wide range of devices. So you don't have to worry about your application not being compatible with multiple devices. The images at the following links shows how a responsive and non-responsive application looks like on a mobile device. http://www.webnersolutions.com/wp-content/uploads/2015/08/responsive-vs-non-responsive-web-design1.jpg At the following link is a live responsive application example. Notice as we resize the browser, the content automatically adpats to the screen size. http://bootstrapdocs.com/v3.0.3/docs/examples/jumbotron/ Saves lot of development time : One of the biggest advantages of using Bootstrap is that it saves lot of development time. Instead of writing code from the scratch, bootstrap offers ready made blocks of code that you can use and customize to suit your application requirements. There are also many websites out there that offer free and paid Bootstrap themes that saves even more development time. Consistency : Bootstrap was developed by Twitter to encourage consistency across thier internal tools by giving their developers a centralised development code. Since all the developers are working using a centralised code, the end result is consistent regardless of who’s working on the project and which web browser is being used. Customizable : If you are using only a few features of bootstrap, you can customize to download only those features using the following bootstrap customize page. http://getbootstrap.com/customize/ Support : As Bootstrap is the most popular framework, it has a very large community base and excellent documentation. Bootstrap's excellent documentation, examples and demos helps a developer learn bootstrap quickly even if you are new to it. If you ever run into an issue you will usually get help quickly and easily from the vast online community and web forums. In our next video we will discuss, downloading, setting up and understanding different bootstrap components. Please stay tuned. Link for all dot net and sql server video tutorial playlists https://www.youtube.com/user/kudvenkat/playlists?sort=dd&view=1 Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2016/05/what-is-bootstrap.html
Views: 609224 kudvenkat
Part 10   What happens if finally block throws an exception
 
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Link for code samples used in the demo http://csharp-video-tutorials.blogspot.com/2013/10/part-10-what-happens-if-finally-block.html Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists This question can also be asked in a slightly different way How to handle exceptions that occur in finally block The exception propagates up, and should be handled at a higher level. If the exception is not handled at the higher level, the application crashes. The "finally" block execution stops at the point where the exception is thrown. In the example below, notice that the "finally" block in "Hello()" method throws an exception. Hello() method is being called in the Main() method and we don't have any exception handling mechanism in place in the Main() method. So, the application crashes with the exception. public class Program { public static void Main() { Hello(); } public static void Hello() { try { // Some code } catch { // Some code } finally { Console.WriteLine("This line will be executed"); int result = Convert.ToInt32("TEN"); Console.WriteLine("This line will NOT be executed"); } } } On the other hand, if you include exception handling mechanism(try/catch) in the Main() method, then you will have the opportunity to handle the exception. public static void Main() { try { Hello(); } catch (Exception ex) { // Process and log the exception Console.WriteLine(ex.Message); } } Irrespective of whether there is an exception or not "finally" block is guaranteed to execute. 1. If the "finally" block is being executed after an exception has occurred in the try block, 2. and if that exception is not handled 3. and if the finally block throws an exception Then the original exception that occurred in the try block is lost. Here is an example: public class Program { public static void Main() { try { Hello(); } catch (Exception ex) { Console.WriteLine(ex.Message); } } public static void Hello() { try { // This exception will be lost throw new Exception("Exception in TRY block"); } finally { throw new Exception("Exception in FINALLY block"); } } }
Views: 112643 kudvenkat
html attribute vs dom property
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2017/06/html-attribute-vs-dom-property.html Slides http://csharp-video-tutorials.blogspot.com/2017/06/html-attribute-vs-dom-property_20.html Angular 2 Tutorial playlist https://www.youtube.com/playlist?list=PL6n9fhu94yhWqGD8BuKuX-VTKqlNBj-m6 Angular 2 Text articles and slides http://csharp-video-tutorials.blogspot.com/2017/06/angular-2-tutorial-for-beginners_12.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists In this video we will discuss the difference between HTML attribute and DOM property. What is DOM DOM stands for Document Object Model. When a browser loads a web page, the browser creates a Document Object Model of that page. In simple terms you can think of the DOM as an application programming interface (API) for HTML, and we can use programming languages like JavaScript, or JavaScript frameworks like Angular to access and manipulate the HTML using their corresponding DOM objects. In other words DOM contains the HTML elements as objects, their properties, methods and events and it is a standard for accessing, modifying, adding or deleting HTML elements. In the previous 2 videos we discussed interpolation and property binding in Angular. Interpolation example [button disabled='{{isDisabled}}']Click Me[/button] Property binding example [button [disabled]='isDisabled']Click Me[/button] If you notice the above 2 examples, it looks like we are binding to the Button's disabled attribute. This is not true. We are actually binding to the disabled property of the button object. Angular data-binding is all about binding to DOM object properties and not HTML element attributes. What is the difference between HTML element attribute and DOM property Attributes are defined by HTML, where as properties are defined by the DOM. Attributes initialize DOM properties. Once the initialization complete, the attributes job is done. Property values can change, where as attribute values can't. Let's prove this point - Property values change, but the attribute values don't with an example. In the example below, we have set the value attribute of the input element to Tom. [input id='inputId' type='text' value='Tom'] At this point, run the web page and in the textbox you will see 'Tom' as the value. Launch the browser developer tools. On the 'Console' tab, use the getattribute() method and value property of the input element to get the attribute and property values. Notice at the moment both have the value 'Tom' Change the value in the textbox to Mary. Notice now, when we query for the attribute and property values, the attribute value is still Tom but the property value is Mary. So this proves the point - Property values change, where as attribute values don't. So it is important to keep in mind that, HTML attributes and the DOM properties are different things. Angular binding works with properties and events, and not attributes. The role of attributes is to initialize element properties and their job is done.
Views: 122563 kudvenkat
Pivot in sql server 2008   Part 54
 
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In this video we will learn about pivot operator. Pivot is a sql server operator that can be used to turn unique values from one column, into multiple columns in the output, there by effectively rotating a table. Text version of the video http://csharp-video-tutorials.blogspot.com/2012/10/pivot-operator-in-sql-server-part-54.html Slides http://csharp-video-tutorials.blogspot.com/2013/09/part-54-pivot-in-sql-server-2008.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 204263 kudvenkat
Union and union all in sql server   Part 17
 
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In this video we will learn about the 1. Purpose of UNION and UNION ALL 2. Difference between UNION and UNION ALL 3. Difference between JOIN and UNION Text version of the video http://csharp-video-tutorials.blogspot.com/2012/08/union-and-union-all-in-sql-server-part.html Slides http://csharp-video-tutorials.blogspot.com/2013/08/part-17-union-and-union-all.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 283986 kudvenkat
Prototype in JavaScript
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/02/prototype-in-javascript.html In this video we will discuss Prototype object in JavaScript. Let us understand it's use with an example. The following Employee constructor function constructs Employee object. function Employee(name) { this.name = name; } There are several ways to add a function to the Employee object. One way is as shown below. This works but the problem with this approach is that, if you create 100 employee objects there will be 100 copies of getName() function. We don't want to be creating copies of functions, instead we want all the objects to share the same function code. This can be achieved using JavaScript prototype object. function Employee(name) { this.name = name; this.getName = function () { return this.name; } } var e1 = new Employee("Mark"); var e2 = new Employee("Sara"); document.write("e1.name = " + e1.getName() + "[br/]"); document.write("e2.name = " + e2.getName() + "[br/]"); Output : e1.name = Mark e2.name = Sara In this example, getName() function is added just to e1 object, and not to e2 object. So e2.getName() would throw an undefined error. function Employee(name) { this.name = name; } var e1 = new Employee("Mark"); e1.getName = function () { return this.name; } var e2 = new Employee("Sara"); document.write("e1.name = " + e1.getName() + "[br/]"); document.write("e2.name = " + e2.getName() + "[br/]"); In the following example getName() function is added to the Employee object using the name of the constructor function. This would also result in undefined error. function Employee(name) { this.name = name; } Employee.getName = function () { return this.name; } var e1 = new Employee("Mark"); var e2 = new Employee("Sara"); document.write("e1.name = " + e1.getName() + "[br/]"); document.write("e2.name = " + e2.getName() + "[br/]"); Using the prototype object to add functions : The following are the advantages of using the prototype object to add functions. 1. No matter how many objects you create, functions are loaded only once into memory 2. Allows you to override functions if required. function Employee(name) { this.name = name; } Employee.prototype.getName = function () { return this.name; } var e1 = new Employee("Mark"); var e2 = new Employee("Sara"); document.write("e1.name = " + e1.getName() + "[br/]"); document.write("e2.name = " + e2.getName() + "[br/]"); Output : e1.name = Mark e2.name = Sara
Views: 85016 kudvenkat
Group by in sql server - Part 11
 
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In this video we will learn 1. Grouping rows using GROUP BY 2. Filtering Groups 3. Difference between WHERE and HAVING clause in sql server Text version of the video http://csharp-video-tutorials.blogspot.com/2012/08/group-by-part-11.html Slides http://csharp-video-tutorials.blogspot.com/2013/08/part-11-group-by.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 471876 kudvenkat
Difference between AngularJS, Angular 2 and Angular 4
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2017/09/difference-between-angularjs-angular-2.html Slides http://csharp-video-tutorials.blogspot.com/2017/09/difference-between-angularjs-angular-2_13.html Angular 2 Tutorial playlist https://www.youtube.com/playlist?list=PL6n9fhu94yhWqGD8BuKuX-VTKqlNBj-m6 Angular 2 Text articles and slides http://csharp-video-tutorials.blogspot.com/2017/06/angular-2-tutorial-for-beginners_12.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists So far Google has released 3 versions of Angular Version Year ------------ ------ AngularJS 2010 Angular 2 2016 Angular 4 2017 What is the difference between AngularJS and Angular 2 The first version of Angular is called AngularJS and was released in the year 2010. Some people call it Angular 1, but it is officially called AngularJS. Angular 2 is released in the year 2016. The most important thing to keep in mind is that, Angular 2 is not a simple upgrade from angular 1. Angular 2 is completely rewritten from the ground up and as a result the way we write applications with AngularJS and Angular 2 is very different. From a performance standpoint, Angular 2 is 5 times faster compared to AngularJS. AngularJS was not built for mobile devices, where as Angular 2 on the other hand is designed from the ground up with mobile support in mind. With Angular 2 we have more language choices. In additon to nativa JavaScript we can use TypeScript, Dart, PureScript, Elm, etc. Angular 4 is released in 2017. So, What is the difference between Angular 2 and Angular 4 If you have worked with both Angular 1 and Angular 2, then you already know that the API's and patterns that we use to build applications are very different between these 2 versions. From a developer stand point, it is like learning 2 different frameworks. Since Angular 2 is a complete rewrite from Angular 1, moving from Angular 1 to Angular 2 is a total breaking change. However, changing from Angular 2 to Angular 4 and even future versions of Angular, won’t be like changing from Angular 1. It won’t be a complete rewrite, it will simply be a change in some core libraries. From a developer standpoint, building an application using Angular 2 and Angular 4 is not very different. We still use the same concepts and patterns. Angular 4 is simply, the next version of Angular 2. The underlying concepts are still the same and if you have already learnt Angular 2 then you’re well prepared to switch to Angular 4. The most important point to keep in mind is, Angular 4 is backwards compatible with Angular 2 for most applications. What has changed and what is new in Angular 4 Some under the hood changes to reduce the size of the AOT (Ahead-of-Time) compiler generated code. Migrating to Angular 4 may reduce the production bundles by hundreds of kilobytes. As a developer this change will not affect the way we write angular applications in any way. TypeScript 2.1 and 2.2 compatibility. Angular is updated with a more recent version of TypeScript, for better type checking throughout our application. Up until Angular 4, only TypeScript 1.8 was supported. With Angular 4, we can use typescript 2.1 or 2.2 which means we can use all the new features of TypeScript with Angular 4. Animation features are pulled out of @angular/core and are moved into their own package. This means that if you don’t use animations, this extra code will not end up in your production bundles. On the other hand, if you do have animations in your application, you may have to change your existing code to pull the animation features from the animations package. We can now use an if/else style syntax with *ngIf structural directive. In Angular 2, to implement if/else logic, we use 2 *ngIf structural directives. With Angular 4, we can use it's new if/else style syntax with *ngIf structural directive. We will discuss an example of this in our upcoming videos. What happened to Angular 3. Why did we move straight from Angular 2 to Angular 4. What is the reason for skipping Angular 3. Except the Router library, all the other Angular core libraries are versioned the same way and are shipped as NPM packages as you can see below. While all the other core angular packages are at Version 2, the router library is already at Version 3. Due to this misalignment of the router package’s version, the angular team decided to go straight for Angular v4. This way, all the core packages are aligned which will be easier to maintain and help avoid confusion in the future. Common Questions Do I have to learn AngularJS 1 before learning Angular 2 Do I have to learn Angular 2 before learning Angular 4
Views: 96411 kudvenkat
Async and await in C# example
 
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In this video we will discuss async and await keywords and their use with an example. Text version of the video http://csharp-video-tutorials.blogspot.com/2016/10/async-and-await-in-c-example.html Slides http://csharp-video-tutorials.blogspot.com/2016/10/async-and-await-in-c-example_31.html All C# Text Articles http://csharp-video-tutorials.blogspot.com/p/free-c-video-tutorial-for-beginners.html All C# Slides http://csharp-video-tutorials.blogspot.com/p/c.html All C# Videos https://www.youtube.com/playlist?list=PLAC325451207E3105 All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 231772 kudvenkat
Transactions in sql server and ACID Tests   Part 58
 
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In this video we will learn about Transaction ACID tests. A successful transaction must pass the "ACID" test, that is a transaction must be Atomic, Consistent, Isolated and Durable. Text version of the video http://csharp-video-tutorials.blogspot.com/2012/10/transaction-acid-tests-part-58.html Slides http://csharp-video-tutorials.blogspot.com/2013/09/part-58-transaction-acid-test.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 120429 kudvenkat
Indexed views in sql server   Part 41
 
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In this video we will learn about, creating indexed views. A unique clustered index, is the first index that should be created on a view. Indexed views are also called as materialized views Text version of the video http://csharp-video-tutorials.blogspot.com/2012/09/indexed-views-in-sql-server-part-41.html Slides http://csharp-video-tutorials.blogspot.com/2013/09/part-41-indexed-views.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 168500 kudvenkat
Lazy loading in angular
 
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In this video we will discuss lazy loading angular modules Text version of the video https://csharp-video-tutorials.blogspot.com/2018/12/lazy-loading-in-angular.html Slides https://csharp-video-tutorials.blogspot.com/2018/12/lazy-loading-in-angular-slides.html Angular 6 Tutorial https://www.youtube.com/playlist?list=PL6n9fhu94yhWNJaDgh0mfae_9xoQ4E_Zj Angular 6 Tutorial Text Articles & Slides http://csharp-video-tutorials.blogspot.com/2018/09/angular-6-tutorial-for-beginners.html Angular, JavaScript, jQuery, Dot Net & SQL Playlists https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd
Views: 27979 kudvenkat
Part 1   How to find nth highest salary in sql
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2014/05/part-1-how-to-find-nth-highest-salary_17.html This is a very common SQL Server Interview Question. There are several ways of finding the nth highest salary. By the end of this video, we will be able to answer all the following questions as well. How to find nth highest salary in SQL Server using a Sub-Query How to find nth highest salary in SQL Server using a CTE How to find the 2nd, 3rd or 15th highest salary Let's use the following Employees table for this demo Use the following script to create Employees table Create table Employees ( ID int primary key identity, FirstName nvarchar(50), LastName nvarchar(50), Gender nvarchar(50), Salary int ) GO Insert into Employees values ('Ben', 'Hoskins', 'Male', 70000) Insert into Employees values ('Mark', 'Hastings', 'Male', 60000) Insert into Employees values ('Steve', 'Pound', 'Male', 45000) Insert into Employees values ('Ben', 'Hoskins', 'Male', 70000) Insert into Employees values ('Philip', 'Hastings', 'Male', 45000) Insert into Employees values ('Mary', 'Lambeth', 'Female', 30000) Insert into Employees values ('Valarie', 'Vikings', 'Female', 35000) Insert into Employees values ('John', 'Stanmore', 'Male', 80000) GO To find the highest salary it is straight forward. We can simply use the Max() function as shown below. Select Max(Salary) from Employees To get the second highest salary use a sub query along with Max() function as shown below. Select Max(Salary) from Employees where Salary [ (Select Max(Salary) from Employees) To find nth highest salary using Sub-Query SELECT TOP 1 SALARY FROM ( SELECT DISTINCT TOP N SALARY FROM EMPLOYEES ORDER BY SALARY DESC ) RESULT ORDER BY SALARY To find nth highest salary using CTE WITH RESULT AS ( SELECT SALARY, DENSE_RANK() OVER (ORDER BY SALARY DESC) AS DENSERANK FROM EMPLOYEES ) SELECT TOP 1 SALARY FROM RESULT WHERE DENSERANK = N To find 2nd highest salary we can use any of the above queries. Simple replace N with 2. Similarly, to find 3rd highest salary, simple replace N with 3. Please Note: On many of the websites, you may have seen that, the following query can be used to get the nth highest salary. The below query will only work if there are no duplicates. WITH RESULT AS ( SELECT SALARY, ROW_NUMBER() OVER (ORDER BY SALARY DESC) AS ROWNUMBER FROM EMPLOYEES ) SELECT SALARY FROM RESULT WHERE ROWNUMBER = 3
Views: 1051964 kudvenkat
Views in sql server   Part 39
 
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In this video we will learn about 1. What is a view 2. Creating example views 3. Advantages of using views Text version of the video http://csharp-video-tutorials.blogspot.com/2012/09/views-in-sql-server-part-39.html Slides http://csharp-video-tutorials.blogspot.com/2013/09/part-39-views-in-sql-server.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 325449 kudvenkat
Part 60 C# Tutorial Difference between String and StringBuilder
 
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Tags string stringbuilder performance system.text.stringbuilder performance advantage of using system.text.stringbuilder over system.string stringbuilder namespace in c# stringbuilder append method c# stringbuilder append function convert stringbuilder object to string when to use stringbuilder over string stringbuilder vs string concatenation c# performance c# string concatenation best practice c# stringbuilder vs string concatenation string manipulation c# In this video we will understand the difference between System.String and System.Text.StringBuilder classes. We will also understand the difference between the terms mutable and immutable strings. C#, SQL Server, WCF, MVC and ASP .NET video tutorials for beginners https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd My Blog: www.csharp-video-tutorials.blogspot.com
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Stored procedures in sql server   Part 18
 
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In this video we will learn 1. What is a stored procedure 2. Stored Procedure example 3. Creating a stored procedure with parameters 4. Altering SP 5. Viewing the text of the SP 6. Dropping the SP 7. Encrypting stored procedure Text version of the video http://csharp-video-tutorials.blogspot.com/2012/08/stored-procedures-part-18.html Slides http://csharp-video-tutorials.blogspot.com/2013/08/part-18-stored-procedures.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
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Derived tables and common table expressions in sql server   Part 48
 
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In this video we will learn about derived tables and common table expressions. CTE stands for common table expressions. We will also find the differences between, views, temporary tables, table variable, derived tables and cte's Text version of the video http://csharp-video-tutorials.blogspot.com/2012/09/derived-table-and-cte-in-sql-server.html Slides http://csharp-video-tutorials.blogspot.com/2013/09/part-48-derived-tables-cte.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
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Deploy angular app to IIS
 
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In this video we will discuss deploying angular application to IIS. Here are the steps Step 1 : Build your angular application. If you want to deploy a development build do a development build using the following Angular CLI command. The base-href option on the build command sets the base-href element in index.html to "/ePortal/" instaed of "/". In the IIS server, we will create an application with name "ePortal" in just a bit. ng build --base-href /ePortal/ If you want to deploy a production build do a production build using the following Angular CLI command. ng build --prod --base-href /ePortal/ In our case let's deploy a production build. After the build is complete, you will notice a folder with name "dist" in your Angular project folder. This folder contains all the build files. These build files need to be copied to a folder on the server where we have IIS installed. Step 2 : Create a folder on the server where you have IIS installed. You can name the folder anything you want. I am going to name the folder "ProductionBuild" and I am creating it in C:\ drive. Step 3 : Now copy all the contents of the "dist" folder into "ProductionBuild" folder Step 4 : Open IIS. There are several ways to do this. One way is to type "inetmgr" in the "Run" window and click "OK" Step 5 : Create an application in IIS. Name it "ePortal". This name has to match the value we have specified for the --base-href option in Step 1. a) Exapand the root IIS node b) Expand Sites c) Right click on "Default Web Site" and select "Add Application" from the context menu d) In the "Alias" textbox, type "ePortal" e) Set the "Physical Path" to folder that contains the build files. In our case it is "ProductionBuild" folder in C:\ drive At this point, if you launch the browser and navigate to http://localhost/ePortal/home, you will see the "home works" message as expected. When you click on the "Employees" tab it also works as expected. However, when you "Refresh" the page by pressing F5, you will see HTTP 404 error Step 6 : To fix this Page Refresh issue in Angular, include the following URL rewrite rule in you web.config file. This web.config file should be in copied the "ProductionBuild" folder where we have the rest of the build files. Please replace [ with LESS_THAN symbol and ] with GREATER_THAN symbol. [?xml version="1.0" encoding="utf-8"?] [configuration] [system.webServer] [rewrite] [rules] [rule name="AngularJS Routes" stopProcessing="true"] [match url=".*" /] [conditions logicalGrouping="MatchAll"] [add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" /] [add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" /] [add input="{REQUEST_URI}" pattern="^/(api)" negate="true" /] [/conditions] [action type="Rewrite" url="/ePortal" /] [/rule] [/rules] [/rewrite] [/system.webServer] [/configuration] Please note : You may also point the IIS application directly to the "dist" folder in RoutingDemo project folder. The downside of this is every time you rebuild your application, the "dist" folder is deleted and recreated. This means you will loose the web.config file and you have to create it again. Text version of the video http://csharp-video-tutorials.blogspot.com/2017/11/deploy-angular-app-to-iis.html Slides http://csharp-video-tutorials.blogspot.com/2017/11/deploy-angular-app-to-iis-slides.html Angular CLI Tutorial https://www.youtube.com/watch?v=rJ9o4TyhSuo&list=PL6n9fhu94yhWUcq5Pc16uf8YKXoZ87Vh_ Angular CLI Text articles & Slides http://csharp-video-tutorials.blogspot.com/2017/10/angular-cli-tutorial-for-beginners.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
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Self join in sql server - Part 14
 
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In this video we will learn about 1. Self Join - Joining a table with itself 2. Self Join is not a different type of join. It can be classified as Inner Self Join, Outer Self Join (Left, Right and Full), or Cross Self Join. Text version of the video http://csharp-video-tutorials.blogspot.com/2012/08/self-join-in-sql-server-part-14.html Slides http://csharp-video-tutorials.blogspot.com/2013/08/part-14-self-join.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
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FromBody and FromUri in Web API
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2016/09/frombody-and-fromuri-in-web-api.html Slides http://csharp-video-tutorials.blogspot.com/2016/09/frombody-and-fromuri-in-web-api_19.html All ASP.NET Web API Text Articles and Slides http://csharp-video-tutorials.blogspot.com/2016/09/aspnet-web-api-tutorial-for-beginners.html All ASP.NET Web API Videos https://www.youtube.com/playlist?list=PL6n9fhu94yhW7yoUOGNOfHurUE6bpOO2b All Dot Net and SQL Server Playlists https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd
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Angular aot vs jit
 
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In this video we will discuss Ahead-of-Time compilation and Just-in-Time compilation in Angular. In Angular we have 2 models of compilation JIT - Just-in-Time Compilation : JIT compilation as the name implies, compiles the application Just-in-Time in the browser at runtime. AOT - Ahead-of-Time Compilation : AOT compilation compiles the application at build time. By default, with the development build we get JIT compilation. This is how it works. The application code along with the angular compiler is downloaded by the browser. At runtime, when a request is issued to the application, the JIT-compiler in the browser compiles the application code before it is executed. This means our user who made that first request has to wait for the application to compile first. In our previous videos we have seen that, when we build our angular application, the following JavaScript bundles are generated. Inline Main Polyfills Styles Vendor The vendor bundle contains the compiler along with the angular framework. The compiler code is roughly half of the Angular framework. There is a tool called source-map-explorer that we can use to inspect the JavaScript bundles. This tool analyzes the source map generated with the bundle and draws a map of all dependencies. To be able to use this tool we have to install it first. To install this tool, execute the following command npm install source-map-explorer --save-dev Once we have the tool installed, if you have not done the development build yet, do the development build using the following command. ng build Once the build is complete, you will have the JavaScript bundles along with the source map files. Now execute the following command. node_modules\.bin\source-map-explorer dist\vendor.bundle.js The above command runs the source-map-explorer against the vendor bundle and we see the graph of it. Notice the angular compiler is around 45% percent of the bundle size. As this is development build and not optimised, notice the total size of the bundle is 2.19 MB. With AOT compilation the angular application is pre-compiled. So this means the browser loads executable code so it can render the application immediately, without waiting to compile the application first. This also mean with AOT, as the application is already pre-compiled, there is also no need for the browser to download the Angular compiler. As we already know, the compiler code is roughly half of the Angular framework, so omitting it dramatically reduces the application size. By default, the production build is Ahead-of-Time compiled. So there is no need to bundle up the angular compiler code in the vendor bundle. This brings down the vendor bundle size by almost 50%. In addition it is also minified, uglified and tree-shaked to remove any code that we are not referencing in our application. So the bundler size is further reduced. Now, execute the following command to generate a production build. Notice I have also turned on sourcemap option. Without the sourcemap we will not be able to use the source-map-explorer tool. ng build --prod --sourcemap true Once the production build is complete, execute the following command. Vendor bundle name in your production build may be slightly different. Change it accordingly and execute the command. node_modules\.bin\source-map-explorer dist\vendor.7e385ef294695236ffd1.bundle.js The AOT compiler also detects and reports template binding errors at build time itself. Let us understand this with an example. Include the following function HomeComponent class in home.component.ts file getText(): string { return 'Hello Pragim'; } In home.component.html include the following [div] element. Notice I have deliberately mis-spelled the getText() function name. [div [innerText]='getTex()'] Save changes, and execute the following command. This command does a development build in-memory. At the moment we are not using AOT, so we will not know about the template binding error that is introduced above. Notice at build time we do not see any errors. ng serve Text version of the video http://csharp-video-tutorials.blogspot.com/2017/11/angular-aot-vs-jit.html Slides http://csharp-video-tutorials.blogspot.com/2017/11/angular-aot-vs-jit-slides.html Angular CLI Tutorial https://www.youtube.com/watch?v=rJ9o4TyhSuo&list=PL6n9fhu94yhWUcq5Pc16uf8YKXoZ87Vh_ Angular CLI Text articles & Slides http://csharp-video-tutorials.blogspot.com/2017/10/angular-cli-tutorial-for-beginners.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
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Part 71   childactiononly attribute in mvc
 
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Link for code samples used in the demo http://csharp-video-tutorials.blogspot.com/2013/08/part-71-childactiononly-attribute-in-mvc.html Link for csharp, asp.net, ado.net, dotnet basics, mvc and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists In this video, we will discuss childactiononly attribute in asp.net mvc. Let us understand this with an example. Step 1: Create a blank asp.net mvc 4 application Step 2: Add HomeController. Copy and paste the following code. public class HomeController : Controller { // Public action method that can be invoked using a URL request public ActionResult Index() { return View(); } // This method is accessible only by a child request. A runtime // exception will be thrown if a URL request is made to this method [ChildActionOnly] public ActionResult Countries(List[String] countryData) { return View(countryData); } } Step 3: Right click on the "Countries()" action method and add "Countries" view. This view will render the given list of strings as an un-ordered list. @model List[string] @foreach (string country in Model) { [ul] [li] [b] @country [/b] [/li] [/ul] } Step 4: Right click on the "Index()" action method and add "Index" view. Copy and paste the following code. Notice that, to invoke childaction, we are using Action() HTML Helper. [h2]Countries List[/h2] @Html.Action("Countries", new { countryData = new List[string]() { "US", "UK", "India" } }) Please Note: Child actions can also be invoked using "RenderAction()" HTMl helper as shown below. @{ Html.RenderAction("Countries", new { countryData = new List[string]() { "US", "UK", "India" } }); } We discussed the difference between Action() and RenderAction() in Part XX of MVC Tutorial series. Points to remember about "ChildActionOnly" attribute 1. Any action method that is decorated with [ChildActionOnly] attribute is a child action method. 2. Child action methods will not respond to URL requests. If an attempt is made, a runtime error will be thrown stating - Child action is accessible only by a child request. 3. Child action methods can be invoked by making child request from a view using "Action()" and "RenderAction()" html helpers. 4. An action method doesn't need to have [ChildActionOnly] attribute to be used as a child action, but use this attribute to prevent if you want to prevent the action method from being invoked as a result of a user request. 5. Child actions are typically associated with partial views, although this is not compulsory. 6. Child action methods are different from NonAction methods, in that NonAction methods cannot be invoked using Action() or RenderAction() helpers. We discussed NonAction methods in Part 70 of ASP.NET MVC tutorial series. 7. Using child action methods, it is possible to cache portions of a view. This is the main advantage of child action methods. We will cover this when we discuss [OutputCache] attribute. Make sure to replace [ with LESSTHAN and ] with GREATERTHAN symbol.
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Difference between $scope and $rootScope
 
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difference between scope and rootscope in angularjs angular scope vs rootscope angular root scope vs scope In this video we will discuss the difference between $scope and $rootScope. The main difference is that, $rootScope is available globally (for all controllers), whereas $scope is only available to the controller that has created it and it's children. Let us understand this with an example. Controller Code : We have 2 controllers (redColourController & greenColourController). redColourController has set redColour property on $scope and rootScopeColour on $rootScope. This means redColour property cannot be used outside the redColourController, where as rootScopeColour that is set on $rootScope can be used anywhere. greenColourController has set greenColour property on $scope. This means greenColour property cannot be used outside the greenColourController var app = angular .module("Demo", []) .controller("redColourController", function ($scope, $rootScope) { $rootScope.rootScopeColour = "I am Root Scope Colour"; $scope.redColour = "I am Red Colour"; }) .controller("greenColourController", function ($scope) { $scope.greenColour = "I am Green Colour"; }) View HTML : [div ng-controller="redColourController"] Root Scope Colour : {{rootScopeColour}} [br /] Red Colour Controller : {{redColour}} [br /] Green Colour Controller : [span style="color:red" ng-show="greenColour == undefined"] greenColour is undefined [/span] [/div] [br /] [div ng-controller="greenColourController"] Root Scope Colour : {{rootScopeColour}} [br /] Green Colour Controller : {{greenColour}} [br /] Red Colour Controller : [span style="color:red" ng-show="redColour == undefined"] redColour is undefined [/span] [/div] Output : From the output it is clear that the rootScopeColour property that is set on $rootScope is available for both the controllers (redColourController & greenColourController). Where as redColour property set on $scope is available only for redColourController and not for greenColourController. Similarly, greenColour property set $scope is available only for greenColourController and not redColourController. Hope this example has made the difference between $rootScope and $scope clear. Link for all dot net and sql server video tutorial playlists https://www.youtube.com/user/kudvenkat/playlists?sort=dd&view=1 Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2016/03/difference-between-scope-and-rootscope.html
Views: 87609 kudvenkat
Snapshot isolation level in sql server
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2015/08/snapshot-isolation-level-in-sql-server.html Slides http://csharp-video-tutorials.blogspot.com/2015/08/snapshot-isolation-level-in-sql-server_19.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists In this video we will discuss, snapshot isolation level in sql server with examples. Just like serializable isolation level, snapshot isolation level does not have any concurrency side effects. What is the difference between serializable and snapshot isolation levels Serializable isolation is implemented by acquiring locks which means the resources are locked for the duration of the current transaction. This isolation level does not have any concurrency side effects but at the cost of significant reduction in concurrency. Snapshot isolation doesn't acquire locks, it maintains versioning in Tempdb. Since, snapshot isolation does not lock resources, it can significantly increase the number of concurrent transactions while providing the same level of data consistency as serializable isolation does. Let us understand Snapshot isolation with an example. Open 2 instances of SQL Server Management studio. From the first window execute Transaction 1 code and from the second window execute Transaction 2 code. Notice that Transaction 2 is blocked until Transaction 1 is completed. --Transaction 1 Set transaction isolation level serializable Begin Transaction Update tblInventory set ItemsInStock = 5 where Id = 1 waitfor delay '00:00:10' Commit Transaction -- Transaction 2 Set transaction isolation level serializable Select ItemsInStock from tblInventory where Id = 1 Now change the isolation level of Transaction 2 to snapshot. To set snapshot isolation level, it must first be enabled at the database level, and then set the transaction isolation level to snapshot. -- Transaction 2 -- Enable snapshot isloation for the database Alter database SampleDB SET ALLOW_SNAPSHOT_ISOLATION ON -- Set the transaction isolation level to snapshot Set transaction isolation level snapshot Select ItemsInStock from tblInventory where Id = 1 From the first window execute Transaction 1 code and from the second window, execute Transaction 2 code. Notice that Transaction 2 is not blocked and returns the data from the database as it was before Transaction 1 has started. Modifying data with snapshot isolation level : Now let's look at an example of what happens when a transaction that is using snapshot isolation tries to update the same data that another transaction is updating at the same time. In the following example, Transaction 1 starts first and it is updating ItemsInStock to 5. At the same time, Transaction 2 that is using snapshot isolation level is also updating the same data. Notice that Transaction 2 is blocked until Transaction 1 completes. When Transaction 1 completes, Transaction 2 fails with the following error to prevent concurrency side effect - Lost update. If Transaction 2 was allowed to continue, it would have changed the ItemsInStock value to 8 and when Transaction 1 completes it overwrites ItemsInStock to 5, which means we have lost an update. To complete the work that Transaction 2 is doing we will have to rerun the transaction. Snapshot isolation transaction aborted due to update conflict. You cannot use snapshot isolation to access table 'dbo.tblInventory' directly or indirectly in database 'SampleDB' to update, delete, or insert the row that has been modified or deleted by another transaction. Retry the transaction or change the isolation level for the update/delete statement. --Transaction 1 Set transaction isolation level serializable Begin Transaction Update tblInventory set ItemsInStock = 5 where Id = 1 waitfor delay '00:00:10' Commit Transaction -- Transaction 2 -- Enable snapshot isloation for the database Alter database SampleDB SET ALLOW_SNAPSHOT_ISOLATION ON -- Set the transaction isolation level to snapshot Set transaction isolation level snapshot Update tblInventory set ItemsInStock = 8 where Id = 1
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Angular promises vs observables
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2017/09/angular-promises-vs-observables.html Slides http://csharp-video-tutorials.blogspot.com/2017/09/angular-promises-vs-observables_5.html Angular 2 Tutorial playlist https://www.youtube.com/playlist?list=PL6n9fhu94yhWqGD8BuKuX-VTKqlNBj-m6 Angular 2 Text articles and slides http://csharp-video-tutorials.blogspot.com/2017/06/angular-2-tutorial-for-beginners_12.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists In this video we will discuss the differences between promises and observables. In Angular 2, to work with asynchronous data we can use either Promises or Observables. In our previous videos in this series, we discussed using both Observables and Promises. There are several differences between Promises and Observables. In this video let's discuss these differences. A Promise emits a single value where as an Observable emits multiple values over a period of time. You can think of an Observable like a stream which emits multiple items over a period of time and the same callback function is called for each item emitted. So with an Observable we can use the same API to handle asynchronous data whether that data is emitted as a single value or multiple values over a period of time. A Promise is not lazy where as an Observable is Lazy. A Promise cannot be cancelled where as an Observable can be cancelled using the unsubscribe() method Observable provides operators like map, forEach, filter, reduce, retry, retryWhen etc
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Part 79   Areas in asp net mvc
 
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Link for code samples used in the demo http://csharp-video-tutorials.blogspot.com/2013/08/part-79-areas-in-aspnet-mvc.html Link for csharp, asp.net, ado.net, dotnet basics, mvc and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists When you create a new asp.net mvc application, the following folders are created with in the root directory. 1. Models 2. Views 3. Controllers This structure is fine for simple applications, but when your application gets big and complex, maintaining your Models, Views and Controllers can get complicated. The structure of a complex asp.net mvc application can be very easily maintained using areas. So, in short areas are introduced in asp.net mvc 2, that allow us to breakdown a large complex application into a several small sections called areas. These areas can have their own set of 1. Models 2. Views 3. Controllers 4. Routes Let's understand this with an example. Let's understand this with an example. Let's say, we are building a Job Portal. It's common for a typical job portal to have the following functional areas. Employee Area - This functional area allows a job seeker to create their profile, upload resume, and perform job search. Employer Area - This functional area allows a job provider to create employer profile, upload jobs, and search for suitable candidates. Administrator Area - This functional area allows an administrator to configure the site and mantain. To create an area in an MVC application 1. Right click on the project name in Solution Explorer and select Add =] Area 2. Provide a meaningful name. For example "Employee" and click Add At this point, "Areas" folder will be created, and with in this, a folder for Emploee area will be added. You can add as many areas as you want. In a similar fashion, add areas for Employer and Admin. Notice that in each area folder (Employee, Employer and Admin), you have a set of Models, Views and Controllers folders. Also, there is "AreaRegistration.cs" file, which contains the code to register a route for the area. Now navigate to Global.asax.cs file and notice Application_Start(). With in this method there is code to register all areas in your application. protected void Application_Start() { AreaRegistration.RegisterAllAreas(); WebApiConfig.Register(GlobalConfiguration.Configuration); FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); RouteConfig.RegisterRoutes(RouteTable.Routes); } At this point Add "HomeController" to the following areas. Notice that we can have a HomeController(Controller with the same) in Employee, Employer, Admin and MainArea. 1. Employee 2. Employer 3. Admin 4. Main Area At this point, we have Index() action method in all of the HomeControllers. public ActionResult Index() { return View(); } Now Add Index view to all the areas. Copy and paste the following HTML in respective Index views. Main Area: [h1]Main Area Index View[/h1] Employee Area: [h1]Employee Area Index View[/h1] Employer Area: [h1]Employer Area Index View[/h1] Admin Area: [h1]Admin Area Index View[/h1] At this point, build the application, and navigate to /MVCDemo. You will get an error. To fix this change RegisterRoutes() method in RouteConfig.cs file in App_start folder. Notice that we are passing the namespace of the HomeController in the Main area using namespace parameter. public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapRoute( name: "Default", url: "{controller}/{action}/{id}", defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }, namespaces: new [] { "MVCDemo.Controllers" } ); } Now, if you navigate to /MVCDemo/Employee, you will get an error - The resource cannot be found. To fix this, change RegisterArea() area method in EmployeeAreaRegistration.cs file in Employee folder as shown below. Notice that we are setting HomeController as the default controller public override void RegisterArea(AreaRegistrationContext context) { context.MapRoute( "Employee_default", "Employee/{controller}/{action}/{id}", new { controller = "Home", action = "Index", id = UrlParameter.Optional } ); } Navigating to http://localhost/MVCDemo/Employee may throw a compilation error related to System.Web.Optimization. If you get this error follow the steps below. 1. In Visual Studio, click Tools - Library PAckage Manager - Package Manager Console 2. In the Package Manager Console window, type the following command and press enter Install-Package Microsoft.Web.Optimization -Pre When we are building links using ActionLink() html helper to navigate between areas, we need to specify area name. once you do this, you will be able to navigate between areas when you click on the respective links.
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Part 72   HandleError attribute in mvc
 
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Link for code samples used in the demo http://csharp-video-tutorials.blogspot.com/2013/08/part-72-handleerror-attribute-in-mvc.html Link for csharp, asp.net, ado.net, dotnet basics, mvc and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists In this video, we will discuss HandleError attribute in asp.net mvc. HandleErrorAttribute is used to display friendly error pages to end user when there is an unhandled exception. Let us understand this with an example. Step 1: Create a blank asp.net mvc 4 application. Step 2: Add a HomeController. Copy and paste the following code. public ActionResult Index() { throw new Exception("Something went wrong"); } Notice that, the Index() action method throws an exception. As this exception is not handled, when you run the application, you will get the default "yellow screen of death" which does not make sense to the end user. Now, let us understand replacing this yellow screen of death, with a friendly error page. Step 3: Enable custom errors in web.config file, that is present in the root directory of your mvc application. "customErrors" element must be nested under "[system.web]" [customErrors mode="On"] [/customErrors] Step 4: Add "Shared" folder under "Views" folder. Add Error.cshtml view inside this folder. Paste the following HTML in Error.cdhtml view. [h2]An unknown problem has occured, please contact Admin[/h2] Run the application, and notice that, you are redirected to the friendly "Error" view, instead of the generic "Yellow screen of death". We did not apply HandleError attribute anywhere. So how did all this work? HandleErrorAttribute is added to the GlobalFilters collection in global.asax. When a filter is added to the GlobalFilters collection, then it is applicable for all controllers and their action methods in the entire application. Right click on "RegisterGlobalFilters()" method in Global.asax, and select "Go To Definition" and you can find the code that adds "HandleErrorAttribute" to GlobalFilterCollection. public static void RegisterGlobalFilters(GlobalFilterCollection filters) { filters.Add(new HandleErrorAttribute()); } Is the friendly error page displayed for HTTP status code 404? No, but there is a way to display the friendly error page. In the HomeController, we do not have List() action method. So, if a user navigates to /Home/List, we get an error - The resource cannot be found. HTTP 404. To display a friendly error page in this case Step 1: Add "ErrorController" to controllers folder. Copy and paste the following code. public class ErrorController : Controller { public ActionResult NotFound() { return View(); } } Step 2: Right click on "Shared" folder and add "NotFound.cshtml" view. Copy and paste the following code. [h2]Please check the URL. The page you are looking for cannot be found[/h2] Step 3: Change "customErrors" element in web.config as shown below. [customErrors mode="On"] [error statusCode="404" redirect="~/Error/NotFound"/] [/customErrors] Make sure to replace [ with LESSTHAN and ] with GREATERTHAN symbol.
Views: 111939 kudvenkat
Transactions in sql server   Part 57
 
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In this video we will learn about transaction processing in sql server. These concepts are applicable to sql server 2000, 2005 an 2008 Text version of the video http://csharp-video-tutorials.blogspot.com/2012/10/transactions-in-sql-server-part-57.html Slides http://csharp-video-tutorials.blogspot.com/2013/09/part-57-transactions-in-sql-server.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 174559 kudvenkat
Coalesce function in sql server   Part 16
 
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In this video we will learn, how to use coalesce() function in sql server, with an example Text version of the video http://csharp-video-tutorials.blogspot.com/2012/08/coalesce-function-in-sql-server-part-16.html Slides http://csharp-video-tutorials.blogspot.com/2013/08/part-16-coalesce-function-in-sql-server.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 248309 kudvenkat
AngularJS tutorial -  What is AngularJS
 
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AngularJS tutorial - What is AngularJS In this video we will discuss What is AngularJS Benefits of AngularJS A simple AngularJS example What is AngularJS AngularJS is a JavaScript framework that helps build applications that run in a web browser. Who developed AngularJS Google is the company that developed AngularJS. AngularJS is an open source project, which means it can be be freely used, changed, and shared by anyone. AngularJS is an excellent framework for building both Single Page Applications (SPA) and Line of Business Applications. Many companies are using Angular today, and there are many public facing web sites that are built with angular. There is a website, https://www.madewithangular.com, that has the list of web sites that are built using AngularJS. Within this list you can find many popular websites. What are the benefits of using AngularJS 1. Dependency Injection : Dependency Injection is something AngularJS does quite well. If you are new to Dependency Injection, don't worry, we will discuss it in detail with examples in a later video. 2. Two Way Data-Binding : One of the most useful feature in AngularJS is the Two Way Data-Binding. The Two Way Data-Binding, keeps the model and the view in sync at all times, that is a change in the model updates the view and a change in the view updates the model. 3. Testing : Testing is an area where Angular really shines. Angular is designed with testing in mind right from the start. Angular makes it very easy to test any of it's components through both unit testing and end to end testing. So there's really no excuse for not testing any of your angular application code. 4. Model View Controller : With angular it is very easy to develop applications in a clean MVC way. All you have to do is split your application code into MVC components. The rest, that is managing those components and connecting them together is done by angular. 5. Many more benefits like controlling the behaviour of DOM elements using directives and the flexibility that angular filters provide. We will discuss directives, filters, Modules, Routes etc with examples in our upcoming videos in this series. To build angular applications you only need one script file and that is angular.js. To get the script file visit https://angularjs.org. From here 1. You can download the angular script file 2. CDN link - We discussed the benefits of using CDN in Part 3 of jQuery tutorial. 3. Various resources to learn angular - Here you will find videos, Free courses, Tutorials and Case Studies. You will also find API reference which is extremeley useful. To get started with angular 1. Add a reference to the angular script 2. Include ng-app attribute What is ng-app In angular, ng-app is called a directive. There are many directives in angular. You can find the complete list of directives on https://angularjs.org. The ng prefix in the directive stands for angular. The ng-app directive is a starting point of AngularJS Application. Angular framework will first check for ng-app directive in an HTML page after the entire page is loaded. If ng-app directive is found, angular bootstraps itself and starts to manage the section of the page that has the ng-app directive. So the obvious next question is, where to place the ng-app directive on the page It should be placed at the root of the HTML document, that is at the [html] tag level or at the [body] tag level, so that angular can control the entire page. However, there is nothing stopping you from placing it on any other HTML element with in the page. When you do this only that element and it's children are managed by angular. Double curly braces are called binding expressions in angular. These All the following are valid expressions in angular {{ 1 == 1 }} - Evaluates to true {{ { name: 'David', age : '30' }.name }} - Returns the name property value {{ ['Mark', 'David', 'Sara'][2] }} - Returns the 2nd element from the array Link for all dot net and sql server video tutorial playlists https://www.youtube.com/user/kudvenkat/playlists?sort=dd&view=1 Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/10/what-is-angularjs.html
Views: 1793511 kudvenkat
Joins in sql server - Part 12
 
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In this video we will learn about 1. The different types of Joins in sql server 2. Cross Join 3. Inner Join 4. Outer Join -- Left , Right and Full Outer Join. Text version of the video http://csharp-video-tutorials.blogspot.com/2012/08/joins-in-sql-server-part-12.html Slides http://csharp-video-tutorials.blogspot.com/2013/08/part-12-joins.html All SQL Server Text Articles http://csharp-video-tutorials.blogspot.com/p/free-sql-server-video-tutorials-for.html All SQL Server Slides http://csharp-video-tutorials.blogspot.com/p/sql-server.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists
Views: 637352 kudvenkat
Inporc asp.net session state mode management   Part 64
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2012/12/inporc-aspnet-session-state-mode.html Slides http://csharp-video-tutorials.blogspot.com/2013/08/part-64-inproc-session-state-mode.html All ASP .NET Text Articles http://csharp-video-tutorials.blogspot.com/p/free-aspnet-video-tutorial.html All ASP .NET Slides http://csharp-video-tutorials.blogspot.com/p/aspnet-slides.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists Asp.net session state mode can have any of the following 4 values. Session state mode is set in web.config file. 1. Off - Disables session state for the entire application. 2. InProc - Will be discussed in this session. When the session state mode is set to InProc, the session state variables are stored on the web server memory inside the asp.net worker process. This is the default session state mode. Web Garden - Web application deployed on a server with multiple processors Web Farm - Web application deployed on multiple server Advantages of InProc session state mode: 1. Very easy to implement. All that is required is, to set, the session state mode=InProc in web.config file. 2. Will perform best because the session state memory is kept on the web server, within the ASP.NET worker process(w3wp.exe). 3. Suitable for web applications hosted on a single server. 4. Objects can be added without serialization Dis-advantages of InProc session state mode: 1. Session state data is lost, when the worker process or application pool is recycled. 2. Not suitable for web farms and web gardens. 3. Scalability could be an issue.
Views: 92337 kudvenkat
ViewModel in ASP NET Core MVC
 
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In this video, we will discuss 1. Why we need a ViewModel in ASP.NET Core MVC 2.ViewModel example in ASP.NET Core MVC Text version of the video https://csharp-video-tutorials.blogspot.com/2019/03/viewmodel-in-aspnet-core-mvc.html Slides https://csharp-video-tutorials.blogspot.com/2019/03/viewmodel-in-aspnet-core-mvc-slides.html ASP.NET Core Text Articles & Slides https://csharp-video-tutorials.blogspot.com/2019/01/aspnet-core-tutorial-for-beginners.html ASP.NET Core Tutorial https://www.youtube.com/playlist?list=PL6n9fhu94yhVkdrusLaQsfERmL_Jh4XmU Angular, JavaScript, jQuery, Dot Net & SQL Playlists https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd
Views: 15239 kudvenkat