public ActionResult Stop(int? id)
        {
            var service = new DummyPlcService();

            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            T_Plc t_Plc = db.T_Plc.Find(id);
            if (t_Plc == null)
            {
                return HttpNotFound();
            }
            service.StopDummyPlc(t_Plc.Id);
               // _DummyService.StopDummyPlc(t_Plc.Id);
            return RedirectToAction("Index");
        }