private void GetPurchasesInCart(string userId) { PurchaseModel model = new PurchaseModel(); double subTotal = 0; List <Purchase> purchaseList = model.GetOrdersInPurchase(userId); CreateShopTable(purchaseList, out subTotal); double vat = subTotal * 0.1; double totalAmount = subTotal + vat + 15; litTotal.Text = "$ " + subTotal; litVat.Text = "$ " + vat; litTotalAmount.Text = "$ " + totalAmount; }