Expect everything to change...

Delegate is a Pointer to a function/method.

What is the benefit of calling the method indirectly via a pointer?

Dictionary def - Delegate: is a representative to communicate between two parties.

    
    class Program
    {
        static void Main(string[] args)
        {
            MyClass obj = new MyClass();
            obj.LongRunning(Callback);
        }

        static void Callback(int i)
        {
            Console.WriteLine(i);
        }
    }

    public class MyClass
    {
        public delegate void CallBack(int i);
        public void LongRunning(CallBack obj)
        {
            for (int i = 0; i < 10000; i++)
            {
                obj(i);
            }
        }
    }

Program Flow

1. Call LongRunning passing Callback method.
2. LongRunning method within MyClass is executed and executes passed in method which is now called obj but in reality it is a Pointer to the Callback method.
3. Callback method is executed on Program class, which writes the current value of i to the console.

my thanks to:
https://www.youtube.com/watch?v=ifbYA8hyvjc
http://www.codeproject.com/Articles/1061085/Delegates-Multicast-delegates-and-Events-in-Csharp