Union,Except and Intersect operator in Linq

While developing a windows service using Linq-To-SQL i was in need of something that will intersect the two list and return a list with the result. After searching on net i have found three great use full operators in Linq Union,Except and Intersect. Here are explanation of each operator.

Union Operator: Union operator will combine elements of both entity and return result as third new entities.

Except Operator: Except operator will remove elements of first entities which elements are there in second entities and will return as third new entities.

Intersect Operator: As name suggest it will return common elements of both entities and return result as new entities.

Let’s take a simple console application as a example where i have used two string array and applied the three operator one by one and print the result using Console.Writeline. Here is the code for that.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;


namespace ConsoleApplication1
{
 class Program
 {
     static void Main(string[] args)
     {
         string[] a = { "a", "b", "c", "d" };
         string[] b = { "d","e","f","g"};

         var UnResult = a.Union(b);
         Console.WriteLine("Union Result");
         foreach (string s in UnResult)
         {
             Console.WriteLine(s);           
         }

         var ExResult = a.Except(b);
         Console.WriteLine("Except Result");
         foreach (string s in ExResult)
         {
             Console.WriteLine(s);
         }

         var InResult = a.Intersect(b);
         Console.WriteLine("Intersect Result");
         foreach (string s in InResult)
         {
             Console.WriteLine(s);
         }
         Console.ReadLine();
        
     }

 }
}

Here is the output of console application as Expected.



Hope this will help you.. Stay tuned for more!!

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ASP.NET4.0-Compatibility Settings for rendering controls

With asp.net 4.0 Microsoft has taken a great step for rendering controls. Now it will have more cleaner html there are lots of enhancement for rendering html controls in asp.net 4.0 now all controls like Menu, List View and other controls renders more cleaner html. But recently i have faced strange problem in rendering controls I have my site in asp.net 3.5 and i want to convert it in asp.net 4.0. I have applied my style as per 3.5 rendering and some of items are obsolete in asp.net 4.0. Modifying style sheet was a tedious job here asp.net 4.0 compatibility setting comes into help.

Asp.net 4.0 compatibility settings provides full backward compatibility in terms of the rendering controls. You can assign this in your web.config section like following.

<system.web>
<pages controlRenderingCompatibilityVersion="3.5|4.0"/>
</system.web>

Here the values of controlRenderingCompatibility is a string which will indicate on which way control should render in browser if you provide 4.0 then it will controls with more cleaner html and while if you want to go with old legacy rendering like 3.5 then you can put 3.5 and it will render same way as you are doing in asp.net 3.5.

Hope this help you!!!

Technorati Tags: ASP.NET 4.0,controlRenderingCompatibility

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ASP.NET 4.0- CompressionEnabled Property in session state 4.0

Hello Guys,

This blog has been quite for few days. Because i was busy with some personal and professional work both and that’s why i am not able to work on writing blog posts which i have discovered in last few days. Here is one features of asp.net 4.0 that I am going to explain.

As a web developer we all know about session. Without the use of session any database driven web application is incomplete. As we all know unlike windows form web forms are state less so when user interacts with web application we need to maintain state amongst web pages and we are using session for maintaining state between web pages for each users. ASP.NET is also provide same kind of session state functionalities. ASP.Net Session state identify request coming for same user and same browser for specific session time out interval and its preserves values in session for that specific time intervals and that’s help us in maintaining state amongst web pages for a specific user.

ASP.NET Session state allows us to store session in three way 1. IncProc 2. Session State Service 3. SQL Server. In SQL Server mode it will store session in SQL Server tables instead of storing it in Server Memory. ASP.NET 4.0 provides a new property called Compression Enabled that means when we store values in serialized form in SQL Server with GZip Compression and that results in better performance.

For that you need to store property in web.config like following.

<sessionState allowCustomSqlDatabase="true" sqlConnectionString="data source=Server;Initial Catalog=aspnetsessionstatedb" compressionEnabled="true" />

That’s it now with the use of this property you can have better performance when you are storing large amount of data in session.But still you need to decide that why you want to stored large amount of data in session because its against best practices.

Technorati Tags: Session,ASP.NET 4.0

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