using System;

using System.Threading;

using System.Threading.Tasks;

​

public class Program

{

    public static void Main()

    {

        int nWorkerThreads;

        int nCompletionPortThreads;

        ThreadPool.GetMaxThreads(out nWorkerThreads, out nCompletionPortThreads);

        Console.WriteLine("Max worker threads: {0}, " +

                          "I/O completion threads: {1}", nWorkerThreads, nCompletionPortThreads);

        for (int i = 0; i < 5; i++)

        {

            ThreadPool.QueueUserWorkItem(JobForAThread);

        }

        Thread.Sleep(3000);

    }

    static void JobForAThread(object state)

    {

        for (int i = 0; i < 3; i++)

        {

            Console.WriteLine("loop {0}, running inside pooled thread {1}",

                           i, Thread.CurrentThread.ManagedThreadId);

            Thread.Sleep(50);

        }

    }

}