private void bt_Delete_Click(object sender, EventArgs e)
{
int iSelectedPromoId = Convert.ToInt32(txt_PromoID.Text);
if (iSelectedPromoId > 0)
{
DataAccessPOS dbPOS = new DataAccessPOS();
dbPOS.Delete_Promotion_By_Id(iSelectedPromoId);
dbPOS.Delete_PromoProducts_By_PromoId(iSelectedPromoId);
bt_Exit.PerformClick();
}
}