private void textBox3_KeyDown(object sender, KeyEventArgs e) { if (e.KeyCode == Keys.Enter) { //if (Class.Function.GetTextId(textBox13.Text) == "") //{ // MessageBox.Show("กรุณาเลือกลูกค้า"); // textBox13.Focus(); return; //} SalePosNew.DialogProductCustomer frm = new SalePosNew.DialogProductCustomer(textBox3.Text, Class.Function.GetTextId(textBox13.Text).ToString()); frm.ShowDialog(); if (frm.DialogResult == DialogResult.OK) { textBox3.Text = frm.getSaleId(); updownimg = frm.getValueUpdown(); if (textBox3.Text != "") { dataGridView1.Columns.Clear(); dataGridView2.Columns.Clear(); getValueSale(textBox3.Text,""); } else { textBox20.Text = "0.00"; } } } }