一个实例明白AutoResetEvent和 ManulResetEvent的用法

public class WaitHandlerExample {
                public static AutoResetEvent waitHandler;
                public static ManualResetEvent manualWaitHandler;

                public static void ThreadPoolMain() {
                        waitHandler = new AutoResetEvent(false);
                        manualWaitHandler = new ManualResetEvent(false);

                        // Queue the task.
                        ThreadPool.QueueUserWorkItem(new WaitCallback(ThreadProc));            
                        ThreadPool.QueueUserWorkItem(new WaitCallback(ThreadProc2));

                        Console.WriteLine("Main thread does some work, then waiting....");
                        manualWaitHandler.WaitOne();
                        //waitHandler.Reset();
                        manualWaitHandler.WaitOne();
                        //waitHandler.Reset();
                        Console.WriteLine("Main thread exits.");
                }

                // This thread procedure performs the task.
                public static void ThreadProc(Object stateInfo) {
                        Thread.Sleep(1000);
                        Console.WriteLine("Hello from the thread pool.");
                        //waitHandler.Set();        //
                        manualWaitHandler.Set();//过去了，但是没关，也就是说 信号还是开着的。
                        //manualWaitHandler.Reset();
                }
                public static void ThreadProc2(object stateInfo) {
                        Thread.Sleep(100);
                        Console.WriteLine("Hello from the thread Pool2");
                        //waitHandler.Set();
                        manualWaitHandler.Set();//过去了，但是没有关
                }
        }