Where are delegates used?

Basically it is similar like the old "C" - function pointer, where functions can be assigned like a variable and called in the run time based on dynamic conditions. C# delegate is the smarter version of function pointer which helps software architects a lot, specially while utilizing design patterns.

At first, a delegate is defined with a specific signature (return type, parameter type and order etc). To invoke a delegate object, one or more methods are required with the EXACT same signature. A delegate object is first created similar like a class object created. The delegate object will basically hold a reference of a function. The function will then can be called via the delegate object.

Refer this article. http://www.c-sharpcorner.com/UploadFile/subhendude/4621/

refer this forum : http://www.c-sharpcorner.com/Forums/Thread/110712/why-use-delegates-only-to-access-methods-is-there-a-pur.aspx

http://www.c-sharpcorner.com/UploadFile/niradhip/delegates109122009063813AM/delegates1.aspx