private void listMonHoc_MouseClick(object sender, MouseEventArgs e) { try { if (listMonHoc.SelectedIndex >= 0) { monDTO = MonBUS.GetRecord(Int32.Parse(listMonHoc.SelectedValue.ToString())); txtTenMonHocUpdate.Text = monDTO.TenMon; } } catch (System.Exception ex) { MessageBox.Show(ex.Message); } }