private void txttentb_DefaultButtonClick(object sender, RoutedEventArgs e)
 {
     grid.ShowLoadingPanel = true;
     txtsdt.IsEnabled = false;
     txttentb.IsEnabled = false;
     QLThuebaoDomainContext dbs = new QLThuebaoDomainContext();
     if (App.admin_119)
     {
         EntityQuery<ds119s> Query = dbs.Getds119Query(txttentb.Text.Trim());
         LoadOperation<ds119s> Load = dbs.Load(Query, LoadOpComplete, null);
     }
     else
     {
         EntityQuery<ds119s> Query = dbs.Getds119Query(txttentb.Text.Trim());
         LoadOperation<ds119s> Load = dbs.Load(Query.Where(p => p.ma_huyen == App.ma_huyen), LoadOpComplete, null);
     }
 }