private void OnOneSecond(object source, EventArgs args)
 {
     if (Elapsed != null)
     {
         MyTCEventArgs mtcea = new MyTCEventArgs("Message from OnOneSecond");
         Elapsed(source, mtcea);
     }
 }
 // static method
 public static void TimerHandlerB(object obj, MyTCEventArgs e)
 {
     Console.WriteLine("Class B handler called");
 }