HOW TO USE OF DELEGATES

A delegate is a form of type-safe function pointer used by the .NET Framework. Delegates are often used to implement callbacks and event listeners. A delegate does not need to know anything about classes of methods it works with.

A delegate is a reference type. But instead of referring to an object, a delegate refers to a method.

Delegates are used in the following cases:

• Event handlers
• Callbacks
• LINQ
• Implementation of design patterns
  
  full Explanation : http://zetcode.com/lang/csharp/delegates/
  
  Thank you !