public ActionResult UpdatePayment(Payment p)
        {
            if (ModelState.IsValid)
            {
                String username = Session["loginName"].ToString();
                String accountType = Session["account"].ToString();
                p.updatePayment(p, username, accountType);
            }
            else
            {

                return View(p);
            }
            return RedirectToAction("Index", "Checkout");
        }