public IActionResult SaveNew(NewPurchaseVoucherVM model)
        {
            var purchaseVoucher = new PurchaseVoucher()
            {
                VoucherCode    = model.VoucherCode,
                ExpirationDate = model.ExpirationDate,
                Discount       = model.Discount
            };

            _repo.Add(purchaseVoucher);
            return(RedirectToAction("List"));
        }
        public IActionResult New()
        {
            var model = new NewPurchaseVoucherVM();

            return(View(model));
        }