Answer / ashish agrawal

Extension methods enable you to "add" methods to existing
types without creating a new derived type, recompiling, or
otherwise modifying the original type. Extension methods are
a special kind of static method, but they are called as if
they were instance methods on the extended type. For client
code written in C# and Visual Basic, there is no apparent
difference between calling an extension method and the
methods that are actually defined in a type.

class ExtensionMethods2
{

static void Main()
{
int[] ints = { 10, 45, 15, 39, 21, 26 };
var result = ints.OrderBy(g => g);
foreach (var i in result)
{
System.Console.Write(i + " ");
}
}
}
//Output: 10 15 21 26 39 45

Answer / ratheesh

The most common extension methods are the LINQ standard query operators that add query functionality to the existing System.Collections.IEnumerable and System.

Answer / aniket

small information : extension methods are nothing but visitor design pattern.

http://www.codeproject.com/Articles/34209/Extension-Methods-in-C

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