using System;

public class Program

{

    // Hello Friends I am messenger (ppl call me Delegate), 

    // my purpose in life is to send message from one place to another

    // Only restriction i have is the type of message that you can send through me.

    public delegate int workHandler(int hours, string str);

    // Now, someone comes and says

    // Hey, i want to use you to get some information, 

    // see i have defined myself to accept the type which you approve of, Happy

    private static int delegate_One (int h, string s){

        Console.WriteLine("Hello delegate_One: " +  h);

        return ++h;

    }

    // Hey, i also want to use you to get some information, 

    // see i have also defined myself to accept the type which you approve of, Happy

    private static int delegate_Two (int h, string s){

        Console.WriteLine("Hello delegate_Two " + h);

        return --h;

    }

    public static void Main()

    {

        Console.WriteLine("Hello World");

        //Delegate says, wow good, 

        // Ok i will register you both in my invocation list 

        // and when someone sends information i will pass it to u. Happy

        workHandler w1 = new workHandler(delegate_One);

        workHandler w2 = new workHandler(delegate_Two);

        // Delegate_TWO say: Delegate sir, we want that you call both of us always

        // but, call me before Delegate_One :)

        //Check the order of o/p, it will be same as the order of delegates added in invocation list

        w1 = w2 + w1;

        // U know above line is called Multicaste delegate (i Hope so :) ) because

        // I am calling both of you 

        // Now Assume someone called OutsideMethod and passes a delegate to do some work.

        //w1(10,"ff");

        OutsideMethod(w1);

    }

    //Anyone outside when called me does not know what i am going to do with the work

    //This helps me in segregating the information, they dont need to know which method will be called

    static void OutsideMethod(workHandler work)

    {

        int returnValue = work(10,"DD");

        //Check what i return, interesting thing is I return the value from Delegate_One method

        //because Delegate_one is last in invocation list

        //Return type will return on last methods value, Interesting isnt it

        Console.WriteLine("Return value will be from the last method invoked: " + returnValue);

    }

}