public delegate void ChangeEventHandler( object sender, ChangeEventArgs e );
Public Delegate Sub ChangeEventHandler( sender As Object, e As ChangeEventArgs )
The event source.
A ChangeEventArgs object that contains data related to the event.
When creating a ChangeEventHandler delegate, identify a method that will handle corresponding events.
To associate an event with an event handler, add a delegate instance to the event.
The event handler is called whenever the event occurs, unless the delegate is removed.
To learn more, see the Events and Delegates topic in MSDN.