using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace ThreadPoolExample
{
    class Program
    {
        static void DoWork(object o)
        {
            int i = (int)o; //in general, we should test whether o is int
            Console.WriteLine("Thread {0} is starting", i);
            Thread.Sleep(3000);
            Console.WriteLine("Thread {0} is stopping", i);
        }

        static void Main(string[] args)
        {
            ThreadPool.SetMaxThreads(3,3);

            for (int i = 1; i < 10; i++)
            {
                ThreadPool.QueueUserWorkItem(DoWork, i);
            }
            Thread.Sleep(20000);
        }
    }
}