private void gridControl1_DoubleClick(object sender, EventArgs e)
{
DataRow row = bus.GetData().Rows[gridView1.FocusedRowHandle];
frmChiTietHoaDon frm = new frmChiTietHoaDon(row["MAHD"].ToString());
frm.Show();
}
public void DisplayHoaDon()
{
/* Load data from table HoaDon and display in gridView */
gridHoaDon.DataSource = hoaDonBus.GetData();
gridView1.ExpandAllGroups();
}