private void buttonTaoMoi_Click(object sender, EventArgs e)
{
Form frm = ThongTin.KiemTraTonTai(typeof(FormDonHang), this.ParentForm);
if (frm != null)
{
FormDonHang f = (FormDonHang)frm;
f.Status = 4;
f.Activate();
}
else
{
FormDonHang fQLDonHang = new FormDonHang();
fQLDonHang.MdiParent = this.ParentForm;
fQLDonHang.Show();
}
}
