public DON_VI_DKDT_DelResult DON_VI_DKDT_Del(string id)
 {
     try
     {
         using (var db = new OOAD_EDUManagementDataContext())
         {
             return db.DON_VI_DKDT_Del(id).FirstOrDefault();
         }
     }
     catch
     {
         return new DON_VI_DKDT_DelResult() { ERRORDESC = "", RESULT = "-1" };
     }
 }