private void btnLuu_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
Hide();
Form frmNH = new FrmNhaphang();
frmNH.ShowDialog();
this.Close();
}
private void btnHoadonNH_ItemClick(object sender, ItemClickEventArgs e)
{
FrmNhaphang nh = new FrmNhaphang();
nh.ShowDialog();
}