private void comboBox1_KeyUp(object sender, KeyEventArgs e) { Regex rx = new Regex(@"^(0|\+84)\d{9}"); if (rx.IsMatch(comboBox1.Text)) { DataTable dt = BLL.getDiningTableExixs(comboBox1.Text); if (dt.Rows.Count > 0) { DataRow row = dt.Rows[0]; MaKH.Text = row["MaKH"].ToString(); TenKH.Text = row["TenKH"].ToString(); DiaChi.Text = row["DiaChi"].ToString(); //SoDiemTichLuy.Text = row["SoDiemTichLuy"].ToString(); NgayGiaNhap.Text = row["NgayGiaNhap"].ToString(); dateTimePicker1.Text = row["ThoiGianDat"].ToString(); dateTimePicker2.Text = row["ThoiGianTra"].ToString(); label2.Text = row["MaBan"].ToString() + " "; Bancanxoa.DataSource = dt; Bancanxoa.DisplayMember = "MaBan"; } else { String et = ""; MaKH.Text = ""; TenKH.Text = ""; DiaChi.Text = ""; //SoDiemTichLuy.Text = row["SoDiemTichLuy"].ToString(); NgayGiaNhap.Text = ""; dateTimePicker2.Text = ""; dateTimePicker1.Text = ""; label2.Text = ""; Bancanxoa.DisplayMember = ""; } } else { String et = ""; MaKH.Text = ""; TenKH.Text = ""; DiaChi.Text = ""; //SoDiemTichLuy.Text = row["SoDiemTichLuy"].ToString(); NgayGiaNhap.Text = ""; dateTimePicker2.Text = ""; dateTimePicker1.Text = ""; label2.Text = ""; Bancanxoa.DisplayMember = ""; } }