What is C# Delegate

A function can have one or more parameters of different data types, 

but what if you want to pass a function itself as a parameter? 

How does C# handle the callback functions or event handler? 

The answer is - delegate.

A delegate is like a pointer to a function. It is a reference type

data type and it holds the reference of a method. 

All the delegates are implicitly derived from 

System.Delegate class.

Advantages

Encapsulating the method's call from caller

Effective use of delegate improves the performance of application

Used to call a method asynchronously

Declaration

public delegate type_of_delegate delegate_name()

Note

You can use delegates without parameters or with parameter list

You should follow the same syntax as in the method 

(If you are referring to the method with two int parameters and int return type,

the delegate which you are declaring should be in the same format. This is why it is referred to as type safe function pointer.)