Example on Delegate, Multicast delegate, Events in C#.Net

Demonstrates delegate in C#.Net

using System;

class Class1

{     public delegate int Calc(int a,int b);

              static int  Multi(int val1,int val2)

              {return val1*val2;}

              static void Main(string[] args)

              {     Calc  delObj = new  Calc(Multi);

Console.Write("Enter val1:");int v1 = Int32.Parse(Console.ReadLine());

Console.Write("Enter val2:");int v2= Int32.Parse(Console.ReadLine());

              int val=delObj(v1,v2);

              Console.WriteLine ("Mutiplication :"+val);

              Console.Read();

              }

}

Demonstrate Multicast delegate in C#.Net

using System;

class Client1

{public void mesg(string s)

       { Console.WriteLine("Mesg to client1:"+s);}

}

class Client2

{public void mesg(string s)

       { Console.WriteLine("Mesg to client2:"+s);}

}

class Client3

{public void mesg(string s)

       {Console.WriteLine("Mesg to client3:"+s);}

}

public class Class1

{     delegate void DelClient (string s);

       public static void Main()

       {

       DelClient del=new DelClient(new Client1().mesg);

         del+=new DelClient(new Client2().mesg);

         del+=new DelClient(new Client3().mesg);

       del("Meeting at 11 am");

       Console.Read();

       }

}

Demonstrating event handling technique in C#.Net

using System;

class EventSource

{     public delegate void EventDelegate();

       public event EventDelegate myEvent;

       public void eventRaiser(){myEvent();}

}

       class EventListener

       {     static void Main(string[] args)

              {

                     EventSource es=new EventSource();

       es.myEvent+=new EventSource.EventDelegate(myEventHandler);

                     es.eventRaiser();

                     Console.Read();

              }

              private static void myEventHandler()

              {

              Console.WriteLine("Event Handler is called!");

               }

       }