void ButtonOK1_Click(object sender, RoutedEventArgs e) { if (DtGrid.SelectedItems.Count > 0) { ObservableCollection <string> ids = new ObservableCollection <string>(); foreach (V_CUSTOMGUERDON tmp in DtGrid.SelectedItems) { ids.Add(tmp.CUSTOMGUERDONID); } client.CustomGuerdonDeleteAsync(ids); LoadData(SAVEID); } }