private void btnTaoLK_Click(object sender, EventArgs e) { KhuyenMaiBLL bll = new KhuyenMaiBLL(); MatHangBLL mhb = new MatHangBLL(); String str; foreach (var item in lisMHLK.SelectedItems) { str = lisMHLK.GetItemText(item); KMInfo kmi = new KMInfo(); kmi.idKM = int.Parse(cboKhuyenMaiLK.SelectedValue.ToString()); kmi.idMH = mhb.getIdByName(str); try { bll.addKM(kmi); MessageBox.Show(kmi.idKM + "-" + kmi.idMH.ToString()); } catch (Exception ex) { MessageBox.Show(ex.Message); } } MessageBox.Show("Tạo liên kết thành công"); }