[QUOTE=RobDog888;3093598][color=navy]Its the signature of the event. The sender is the object that the event is being raised upon. So if you have a event with several handles objects you can determine which object was invoked.

Though i get this answer now, but as a matter of fact, I found your reply so helpful Rob.

but there is a thing which is passing over my head i.e.
Its the signature of the event. The sender is the object that the event is being raised upon.
Would you please show me that what does it mean?