protected void CreateUser_Click(object sender, EventArgs e)
        {
            var manager = Context.GetOwinContext().GetUserManager<ApplicationUserManager>();
            var signInManager = Context.GetOwinContext().Get<ApplicationSignInManager>();
            var user = new ApplicationUser() { UserName = Email.Text, Email = Email.Text };
            IdentityResult result = manager.Create(user, Password.Text);
            if (result.Succeeded)
            {
                // For more information on how to enable account confirmation and password reset please visit http://go.microsoft.com/fwlink/?LinkID=320771
                //string code = manager.GenerateEmailConfirmationToken(user.Id);
                //string callbackUrl = IdentityHelper.GetUserConfirmationRedirectUrl(code, user.Id, Request);
                //manager.SendEmail(user.Id, "Confirm your account", "Please confirm your account by clicking <a href=\"" + callbackUrl + "\">here</a>.");

                signInManager.SignIn( user, isPersistent: false, rememberBrowser: false);
                using (TinyGeckoToyCompany.Logic.ShoppingCartActions usersShoppingCart = new TinyGeckoToyCompany.Logic.ShoppingCartActions())
                {
                    String cartId = usersShoppingCart.GetCartId();
                    usersShoppingCart.MigrateCart(cartId, user.Id);
                }
                IdentityHelper.RedirectToReturnUrl(Request.QueryString["ReturnUrl"], Response);
            }
            else
            {
                ErrorMessage.Text = result.Errors.FirstOrDefault();
            }
        }
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                // Verify user has completed the checkout process.
                if ((string)Session["userCheckoutCompleted"] != "true")
                {
                    Session["userCheckoutCompleted"] = string.Empty;
                    Response.Redirect("CheckoutError.aspx?" + "Desc=Unvalidated%20Checkout.");
                }

                NVPAPICaller payPalCaller = new NVPAPICaller();

                string retMsg = "";
                string token = "";
                string finalPaymentAmount = "";
                string PayerID = "";
                NVPCodec decoder = new NVPCodec();

                token = Session["token"].ToString();
                PayerID = Session["payerId"].ToString();
                finalPaymentAmount = Session["payment_amt"].ToString();

                bool ret = payPalCaller.DoCheckoutPayment(finalPaymentAmount, token, PayerID, ref decoder, ref retMsg);
                if (ret)
                {
                    // Retrieve PayPal confirmation value.
                    string PaymentConfirmation = decoder["PAYMENTINFO_0_TRANSACTIONID"].ToString();
                    TransactionId.Text = PaymentConfirmation;

                    ProductContext _db = new ProductContext();
                    // Get the current order id.
                    int currentOrderId = -1;
                    if (Session["currentOrderId"] != string.Empty)
                    {
                        currentOrderId = Convert.ToInt32(Session["currentOrderID"]);
                    }
                    Order myCurrentOrder;
                    if (currentOrderId >= 0)
                    {
                        // Get the order based on order id.
                        myCurrentOrder = _db.Orders.Single(o => o.OrderId == currentOrderId);
                        // Update the order to reflect payment has been completed.
                        myCurrentOrder.PaymentTransactionId = PaymentConfirmation;
                        // Save to DB.
                        _db.SaveChanges();
                    }

                    // Clear shopping cart.
                    using (TinyGeckoToyCompany.Logic.ShoppingCartActions usersShoppingCart =
                        new TinyGeckoToyCompany.Logic.ShoppingCartActions())
                    {
                        usersShoppingCart.EmptyCart();
                    }

                    // Clear order id.
                    Session["currentOrderId"] = string.Empty;
                }
                else
                {
                    Response.Redirect("CheckoutError.aspx?" + retMsg);
                }
            }
        }
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                NVPAPICaller payPalCaller = new NVPAPICaller();

                string retMsg = "";
                string token = "";
                string PayerID = "";
                NVPCodec decoder = new NVPCodec();
                token = Session["token"].ToString();

                bool ret = payPalCaller.GetCheckoutDetails(token, ref PayerID, ref decoder, ref retMsg);
                if (ret)
                {
                    Session["payerId"] = PayerID;

                    var myOrder = new Order();
                    myOrder.OrderDate = Convert.ToDateTime(decoder["TIMESTAMP"].ToString());
                    myOrder.Username = User.Identity.Name;
                    myOrder.FirstName = decoder["FIRSTNAME"].ToString();
                    myOrder.LastName = decoder["LASTNAME"].ToString();
                    myOrder.Address = decoder["SHIPTOSTREET"].ToString();
                    myOrder.City = decoder["SHIPTOCITY"].ToString();
                    myOrder.State = decoder["SHIPTOSTATE"].ToString();
                    myOrder.PostalCode = decoder["SHIPTOZIP"].ToString();
                    myOrder.Country = decoder["SHIPTOCOUNTRYCODE"].ToString();
                    myOrder.Email = decoder["EMAIL"].ToString();
                    myOrder.Total = Convert.ToDecimal(decoder["AMT"].ToString());

                    // Verify total payment amount as set on CheckoutStart.aspx.
                    try
                    {
                        decimal paymentAmountOnCheckout = Convert.ToDecimal(Session["payment_amt"].ToString());
                        decimal paymentAmoutFromPayPal = Convert.ToDecimal(decoder["AMT"].ToString());
                        if (paymentAmountOnCheckout != paymentAmoutFromPayPal)
                        {
                            Response.Redirect("CheckoutError.aspx?" + "Desc=Amount%20total%20mismatch.");
                        }
                    }
                    catch (Exception)
                    {
                        Response.Redirect("CheckoutError.aspx?" + "Desc=Amount%20total%20mismatch.");
                    }

                    // Get DB context.
                    ProductContext _db = new ProductContext();

                    // Add order to DB.
                    _db.Orders.Add(myOrder);
                    _db.SaveChanges();

                    // Get the shopping cart items and process them.
                    using (TinyGeckoToyCompany.Logic.ShoppingCartActions usersShoppingCart = new TinyGeckoToyCompany.Logic.ShoppingCartActions())
                    {
                        List<CartItem> myOrderList = usersShoppingCart.GetCartItems();

                        // Add OrderDetail information to the DB for each product purchased.
                        for (int i = 0; i < myOrderList.Count; i++)
                        {
                            // Create a new OrderDetail object.
                            var myOrderDetail = new OrderDetail();
                            myOrderDetail.OrderId = myOrder.OrderId;
                            myOrderDetail.Username = User.Identity.Name;
                            myOrderDetail.ProductId = myOrderList[i].ProductId;
                            myOrderDetail.Quantity = myOrderList[i].Quantity;
                            myOrderDetail.UnitPrice = myOrderList[i].Product.UnitPrice;

                            // Add OrderDetail to DB.
                            _db.OrderDetails.Add(myOrderDetail);
                            _db.SaveChanges();
                        }

                        // Set OrderId.
                        Session["currentOrderId"] = myOrder.OrderId;

                        // Display Order information.
                        List<Order> orderList = new List<Order>();
                        orderList.Add(myOrder);
                        ShipInfo.DataSource = orderList;
                        ShipInfo.DataBind();

                        // Display OrderDetails.
                        OrderItemList.DataSource = myOrderList;
                        OrderItemList.DataBind();
                    }
                }
                else
                {
                    Response.Redirect("CheckoutError.aspx?" + retMsg);
                }
            }
        }