using System;
using System.Threading;

namespace ConsoleApplication1
{
    public class Program
    {      
        static public void Main(string[] args)
        {
            Console.WriteLine("MainThreadId:" + Thread.CurrentThread.ManagedThreadId);

            Action<string> test = Test;
            test.BeginInvoke("mzwu.com", TestCallback, test);

            Console.ReadKey();
        }

        static void Test(string str)
        {
            Console.WriteLine("SubThreadId:" + Thread.CurrentThread.ManagedThreadId);
        }

        static void TestCallback(IAsyncResult ar)
        {
            Action<string> handler = (Action<string>)ar.AsyncState;
            handler.EndInvoke(ar);
        }
    }
}