DECLARATION OF DELEGATE

class mydelegate
                               {
                                   public delegate void print(int val);
                                }
                                     class test
                                                        {
                                                             public static void display(int val)
                                                         {
                                                                console.writeline(val);
                                                          }
                                                                    public static void main()
                                                             {
                                                                  mydelegate.print func=new mydelegate.print(10);
                                                                  func(display);
                                                             }
                                                 }

EXAMPLE OF DELEGATE BY A SIMPLE PROGRAM 

using System;

namespace Deleg
{
 class Calculation
 {
  public delegate void calcHandler(double d1, double d2);
  public void calculate(calcHandler clc, double d1,double d2)
  {
   clc(d1,d2);
  }
 }
 class MyClass
 {
  public static void add(double d1, double d2)
  {
   Console.WriteLine("Summation = " + (d1+d2));
  }
  public static void subtract(double d1, double d2)
  {
   Console.WriteLine("Subtract = " + (d1-d2));
  }
  public static void multiply(double d1, double d2)
  {
   Console.WriteLine("Multiplication = " + (d1*d2));
  }

  public static void devide(double d1, double d2)
  {
   Console.WriteLine("Devision = " + (d1/d2));
  }

  public static void Main()
  {
  Calculation.calcHandler myDele = new Calculation.calcHandler  (add);
  myDele += new Calculation.calcHandler(subtract);
  myDele += new Calculation.calcHandler(multiply);
  myDele += new Calculation.calcHandler(devide);
  Calculation c = new Calculation();
  c.calculate(myDele,50,40);
  Console.Read();
  }
 }
}

ADVANTAGE OF USING DELEGATE
dynamic binding can be done by using delegate because we can call more than one methods at a time dynamically by calling the delegate in which the methods is defined.