Anonymous methods are code just like delegates.They contain the body part without defining the signature associated. When writing an anonymous methods you need not specify the return type.

These methods are declared with the creation of the delegate instance, with a delegate keyword for more see the example below:

delegate void NumberChanger(int n);
...
NumberChanger nc = delegate(int x)
{
   Console.WriteLine("Anonymous Method: {0}", x);
};

The following code will give a better idea for implementing the anonymous method:

using System;

delegate void NumberChanger(int n);
namespace DelegateAppl
{
   class TestDelegate
   {
      static int num = 10;
      public static void AddNum(int p)
      {
         num += p;
         Console.WriteLine("Named Method: {0}", num);
      }

      public static void MultNum(int q)
      {
         num *= q;
         Console.WriteLine("Named Method: {0}", num);
      }

      public static int getNum()
      {
         return num;
      }
      static void Main(string[] args)
      {
         //create delegate instances using anonymous method
         NumberChanger nc = delegate(int x)
         {
            Console.WriteLine("Anonymous Method: {0}", x);
         };

         //calling the delegate using the anonymous method 
         nc(10);

         //instantiating the delegate using the named methods 
         nc =  new NumberChanger(AddNum);

         //calling the delegate using the named methods 
         nc(5);

         //instantiating the delegate using another named methods 
         nc =  new NumberChanger(MultNum);

         //calling the delegate using the named methods 
         nc(2);
         Console.ReadKey();
      }
   }
}