private void btn_thanh_toan_Click(object sender, EventArgs e)
{
GUI_form_thanh_toan t = new GUI_form_thanh_toan();
this.Hide();
t.ShowDialog();
this.Show();
}
private void btn_thanhtoan_Click(object sender, EventArgs e)
{
if (txt_sohd.Text == "")
{
MessageBox.Show("Bàn đang trống, không thể thanh toán");
}
else
{
GUI_form_thanh_toan f = new GUI_form_thanh_toan(txt_soban.Text);
f.ShowDialog();
this.Close();
}
}
