private void button4_Click(object sender, EventArgs e) { if (lst_tanks.SelectedItems.Count > 0) { UnloadingDipReadings read = (UnloadingDipReadings)lst_tanks.SelectedItems[0].Tag; CustomeRepository.UpdateDipValues(txt_DocNo.Text.Trim(), read.TankD, num_afterReading.Value, 2); if (txt_DocNo.Text.Trim() != "") { LoadTanks(txt_DocNo.Text); } } }