using System;

using System.Linq;

using System.Threading;

using System.Numerics;

using System.Collections.Generic;

using System.Runtime.Remoting.Messaging;

using System.Reflection;

​

​

class Number

{

    private int count;

    public Number(int count)

    {

        this.count = count;

    }

    public int PrintNumber()

    {

        int sum = 0;

        for(int i = 0; i < count; i++)

        {

            Thread.Sleep(1000);

            sum += i+1;

        }

        return sum;

    }

}

​

​

public delegate int MyDel();

​

​

​

public class Program

{

    public static void Main()

    {

        Number n = new Number(6);

        MyDel d = new MyDel(n.PrintNumber);

        d.BeginInvoke(new AsyncCallback(Alarm),null);

        for(int i = 1; i <= 10; i++)

        {

            Thread.Sleep(1000);

            Console.WriteLine("Second: {0}",i);

        }

    }

    public static void Alarm(IAsyncResult ascr)

    {

        Console.WriteLine("End method!");

        Console.WriteLine("Result is {0}",((MyDel)((AsyncResult)ascr).AsyncDelegate).EndInvoke(ascr));

    }

}