public CHUYEN_NGANH_UpdResult CHUYEN_NGANH_Upd(XElement xmlData)
 {
     try
     {
         using (var db = new OOAD_EDUManagementDataContext())
         {
             return db.CHUYEN_NGANH_Upd(xmlData).FirstOrDefault();
         }
     }
     catch (Exception e) { return new CHUYEN_NGANH_UpdResult() { errorDesc = e.Message, result = "-1" }; }
 }