private void txtItem_KeyUp(object sender, KeyEventArgs e) { if (e.KeyValue == 13) { if (txtItem.Text.Trim() != "") { if (lbScanned.Items.Contains(txtItem.Text.Trim())) { MessageBox.Show("Duplicate"); } else { WS.AddStockTakeItem(StockTakeID, int.Parse(txtBin.Text), txtItem.Text.Trim()); lbScanned.Items.Add(txtItem.Text.Trim()); lblQty.Text = lbScanned.Items.Count.ToString(); } } txtItem.Text = ""; } }