public THI_SINH_DelResult THI_SINH_Del(string maThiSinh) { try { using (var db = new OOAD_EDUManagementDataContext()) { return db.THI_SINH_Del(maThiSinh).FirstOrDefault(); } } catch (Exception e) { return new THI_SINH_DelResult() { RESULT = "-1", ERRORDESC = e.Message }; } }