using System.Threading;

using System.Diagnostics;

namespace PoolThread

{

    class MyProcess

    {

        public ManualResetEvent doneEvent;

        public MyProcess(ManualResetEvent sendEvent)

         {

        // Assign notify event from ThreadPool

         this.doneEvent = sendEvent;

         }

       public void MyProcessThreadPoolCallback(Object index)

        {

            int threadIndex = (int)index;

         Console.WriteLine("thread {0} started...", threadIndex);

        // Call the process that is created on every thread

         StartProcess();

         Console.WriteLine("thread {0} end...", threadIndex);

        // Indicates that the process has been completed

         this.doneEvent.Set();

        }

// Start any process

    public void StartProcess()

     {

        // Start process that open c:\ directory

         Process.Start("C:\\");

      }

 }

public class ThreadPoolExample

 {

     static void Main()

     {

         const int totalCountProcess = 10;

         // Create manualresetevent array to assign with process

         ManualResetEvent[] sendEvents = new ManualResetEvent[totalCountProcess];

         // Create MyProcess objects array

         MyProcess[] MyProcessArray = new MyProcess[totalCountProcess];

         // Configure and launch threads using ThreadPool:

         Console.WriteLine("launching thread...");

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

         {

             sendEvents[i] = new ManualResetEvent(false);

             MyProcess p = new MyProcess(sendEvents[i]);

             MyProcessArray[i] = p;

             // ThreadPool call QueueUserWorkItem method to execute when ThreadPool having thread

             ThreadPool.QueueUserWorkItem(p.MyProcessThreadPoolCallback, i);

             // After execute one thread it go in sleep mode for 2 second

             Thread.Sleep(2000);

         }

         // Wait for all thread to complete execution

         WaitHandle.WaitAll(sendEvents);

         Console.WriteLine("All process are complete.");

         Console.ReadKey();

           }

    }

}