public SAP_PHONG_THI_THEO_KHOIResult SAP_PHONG_THI_THEO_KHOI(int soLuongTSToiDa1Phong) { try { using (var db = new OOAD_EDUManagementDataContext()) { return db.SAP_PHONG_THI_THEO_KHOI(soLuongTSToiDa1Phong).FirstOrDefault(); } } catch (Exception ex) { return new SAP_PHONG_THI_THEO_KHOIResult() { ERRORDESC = ex.Message, RESULT = "-1" }; } }