private void DeleteMecanicButton_OnClick(object sender, RoutedEventArgs e) { IList selectedMechanics = MechanicsDataGrid.SelectedItems; int mechanicsSize = selectedMechanics.Count; for (var i = 0; i < mechanicsSize; i++) { DataRowView row = (DataRowView)MechanicsDataGrid.SelectedItems[i]; string textId = row["Id"].ToString(); int id = Convert.ToInt32(textId); _client.DeleteMecanic(id); } MechanicsTabItem_OnLoaded(sender, e); }