public ActionResult DeleteGroup(Guid id)
 {
     try
     {
         _timeTableService.DeleteGroup(id);
         return(Json(new { success = true }, JsonRequestBehavior.AllowGet));
     }
     catch (ValidationException ex)
     {
         ViewBag.Error = ex.Message;
         return(PartialView("_ErrorDeletePartial"));
     }
 }