static ManualResetEvent signal;
 public static void Start()
 {
   signal = new ManualResetEvent(false);
   EventLog ewApplication = new EventLog("Application", ".", "Application");
   ewApplication.EntryWritten += new EntryWrittenEventHandler(MyOnEntryWritten);
   ewApplication.EnableRaisingEvents = true;

   signal.WaitOne();
  }

   private void Stop()
   {
     **signal.Reset();    //not working
     signal.Close();    //not working**
   }