private void btnNewDH_Click(object sender, EventArgs e)
{
LapDonHang lapDonHang = new LapDonHang();
lapDonHang.Show();
}
private void orderToolStripMenuItem_Click(object sender, EventArgs e)
{
LapDonHang lapDonHang = new LapDonHang();
addForm(lapDonHang);
}
