Async Callback Delegate : Asynchronous « Thread « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Thread
3. Asynchronous

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Runtime.Remoting.Messaging;

  public delegate int BinaryOp(int x, int y);

  class Program
  {
    static void Main(string[] args)
    {
      Console.WriteLine("Main() invoked on thread {0}.",Thread.CurrentThread.ManagedThreadId); 
      BinaryOp b = new BinaryOp(Add);
      IAsyncResult iftAR = b.BeginInvoke(10, 10,new AsyncCallback(AddComplete),"adding these numbers.");
      Console.ReadLine();
    }
    static void AddComplete(IAsyncResult itfAR)
    {
      Console.WriteLine("AddComplete() invoked on thread {0}.",Thread.CurrentThread.ManagedThreadId); 
      AsyncResult ar = (AsyncResult)itfAR;
      BinaryOp b = (BinaryOp)ar.AsyncDelegate;
      Console.WriteLine("10 + 10 is {0}.", b.EndInvoke(itfAR));
      string msg = (string)itfAR.AsyncState;
      Console.WriteLine(msg);
    }
    static int Add(int x, int y){
      Console.WriteLine("Add() invoked on thread {0}.",Thread.CurrentThread.ManagedThreadId); 
      Thread.Sleep(5000);
      return x + y;
    }
  }