Events Programming in C#

Events

- An event is an automatic notification that some action  has occurred.

-  An event might be a button push, a menu selection, and so forth. In short, something

happens and you must respond to it with an event handler. 

-  Event is a member of a class and are declared using the event keyword which has the

form-

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Final_events

{

    // Declare a delegate for an event.  

    delegate void MyEventHandler();

    // Declare an event class. 

    class MyEvent

    {

        public event MyEventHandler SomeEvent; 

 

          // This is called to fire the event. 

          public void OnSomeEvent() { 

            if(SomeEvent != null) 

              SomeEvent(); 

          } 

        }

   

    

    class Program

    {

        // An event handler. 

        static void handler()

        {

            Console.WriteLine("Event occurred");

        }

        static void Main(string[] args)

        {

            MyEvent evt = new MyEvent(); 

 

            // Add handler() to the event list. 

            evt.SomeEvent += handler; 

         

            // Fire the event. 

            evt.OnSomeEvent();

            Console.ReadKey();

        }

    }

}