using System;

 using System.Threading;

 // Visual Studio: Replace the default class in a Console project with

 //                the following class.

 class Example

 {

     private static AutoResetEvent event_1 = new AutoResetEvent(true);

     private static AutoResetEvent event_2 = new AutoResetEvent(false);

     static void Main()

     {

         Console.WriteLine("Press Enter to create three threads and start them.\r\n" +

                           "The threads wait on AutoResetEvent #1, which was created\r\n" +

                           "in the signaled state, so the first thread is released.\r\n" +

                           "This puts AutoResetEvent #1 into the unsignaled state.");

         Console.ReadLine();

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

         {

             Thread t = new Thread(ThreadProc);

             t.Name = "Thread_" + i;

             t.Start();

         }

         Thread.Sleep();

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

         {

             Console.WriteLine("Press Enter to release another thread.");

             Console.ReadLine();

             event_1.Set();

             Thread.Sleep();

         }

         Console.WriteLine("\r\nAll threads are now waiting on AutoResetEvent #2.");

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

         {

             Console.WriteLine("Press Enter to release a thread.");

             Console.ReadLine();

             event_2.Set();

             Thread.Sleep();

         }

         // Visual Studio: Uncomment the following line.

         //Console.Readline();

     }

     static void ThreadProc()

     {

         string name = Thread.CurrentThread.Name;

         Console.WriteLine("{0} waits on AutoResetEvent #1.", name);

         event_1.WaitOne();

         Console.WriteLine("{0} is released from AutoResetEvent #1.", name);

         Console.WriteLine("{0} waits on AutoResetEvent #2.", name);

         event_2.WaitOne();

         Console.WriteLine("{0} is released from AutoResetEvent #2.", name);

         Console.WriteLine("{0} ends.", name);

     }

 }

 /* This example produces output similar to the following:

 Press Enter to create three threads and start them.

 The threads wait on AutoResetEvent #1, which was created

 in the signaled state, so the first thread is released.

 This puts AutoResetEvent #1 into the unsignaled state.

 Thread_1 waits on AutoResetEvent #1.

 Thread_1 is released from AutoResetEvent #1.

 Thread_1 waits on AutoResetEvent #2.

 Thread_3 waits on AutoResetEvent #1.

 Thread_2 waits on AutoResetEvent #1.

 Press Enter to release another thread.

 Thread_3 is released from AutoResetEvent #1.

 Thread_3 waits on AutoResetEvent #2.

 Press Enter to release another thread.

 Thread_2 is released from AutoResetEvent #1.

 Thread_2 waits on AutoResetEvent #2.

 All threads are now waiting on AutoResetEvent #2.

 Press Enter to release a thread.

 Thread_2 is released from AutoResetEvent #2.

 Thread_2 ends.

 Press Enter to release a thread.

 Thread_1 is released from AutoResetEvent #2.

 Thread_1 ends.

 Press Enter to release a thread.

 Thread_3 is released from AutoResetEvent #2.

 Thread_3 ends.

  */