Async 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;

  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, null, null);
      while (!iftAR.AsyncWaitHandle.WaitOne(1000, true))
      {
        Console.WriteLine("Doing more work in Main()!");
      }
      int answer = b.EndInvoke(iftAR);
      Console.WriteLine("10 + 10 is {0}.", answer);
      Console.ReadLine();
    }
    static int Add(int x, int y)
    {
      Console.WriteLine("Add() invoked on thread {0}.",Thread.CurrentThread.ManagedThreadId); 
      Thread.Sleep(5000);
      return x + y;
    }  
  }