C# Thread Pool

private static ManualResetEvent[] resetEvents; private static void Main(string[] args){ int thread_num = 100; resetEvents = new ManualResetEvent[thread_number]; for(int i=0; i<thread_num; i++){ resetEvents[i] = new ManualResetEvent(false); ThreadPool.QueueUserWorkItem(new WaitCallback(DoWork), (object)i); } WaitHandle.WaitAll(resetEvents); } private static void DoWork(object o) { int index = (int)o; for (int i = 1; i < 100000; i++){ //// } ConsoleWriteLine(index + " end"); resetEvents[index].Set(); }