July 5, 2007
Hi Guys
I got the following program from a website. Address is given below. The program uses the built-in EventHandler delegate. I wish to know in what circumstance programmer has to decide whether he has to use custom made EventHandler delegate or built-in EventHandler delegate. Please help.
Thank you
//Use the built-in EventHandler delegate
//http://www.java2s.com/Code/CSharp/Language-Basics/UsethebultinEventHandlerdelegate.htm
using System;
// Declare an event class.
class MyEvent
{
public event EventHandler SomeEvent; // uses EventHandler delegate
// This is called to fire SomeEvent.
public void OnSomeEvent()
if(SomeEvent != null)
SomeEvent(this, EventArgs.Empty);
}
public class EventDemo6
static void handler(object source, EventArgs arg)
Console.WriteLine("Event occurred");
Console.WriteLine("Source is " + source);
public static void Main()
MyEvent evt = new MyEvent();
// Add handler() to the event list.
evt.SomeEvent += new EventHandler(handler);
// Fire the event.
evt.OnSomeEvent();