public void ProcessOrder(Cart cart, ShippingDetails shippingInfo)
        {
            using (var smtpClient = new SmtpClient())
            {
                smtpClient.EnableSsl = emailSettings.UseSsl;
                smtpClient.Host = emailSettings.ServerName;
                smtpClient.Port = emailSettings.ServerPort;
                smtpClient.UseDefaultCredentials = false;
                smtpClient.Credentials
                = new NetworkCredential(emailSettings.Username,
                emailSettings.Password);
                if (emailSettings.WriteAsFile)
                {
                    smtpClient.DeliveryMethod
                    = SmtpDeliveryMethod.SpecifiedPickupDirectory;
                    smtpClient.PickupDirectoryLocation = emailSettings.FileLocation;
                    smtpClient.EnableSsl = false;
                }
                StringBuilder body = new StringBuilder()
                .AppendLine("A new order has been submitted")
                .AppendLine("---")
                .AppendLine("Items:");
                foreach (var line in cart.Lines)
                {
                    var subtotal = line.Product.Price * line.Quantity;
                    body.AppendFormat("{0} x {1} (subtotal: {2:c}", line.Quantity,
                    line.Product.Name,
                    subtotal);
                }
                body.AppendFormat("Total order value: {0:c}", cart.ComputeTotalValue())
                .AppendLine("---")
                .AppendLine("Ship to:")
                .AppendLine(shippingInfo.Name)
                .AppendLine(shippingInfo.Line1)
                .AppendLine(shippingInfo.Line2 ?? "")
                .AppendLine(shippingInfo.Line3 ?? "")
                .AppendLine(shippingInfo.City)
                .AppendLine(shippingInfo.State ?? "")
                .AppendLine(shippingInfo.Country)
                .AppendLine(shippingInfo.Zip)
                .AppendLine("---")
                .AppendFormat("Gift wrap: {0}",
                shippingInfo.GiftWrap ? "Yes" : "No");
                MailMessage mailMessage = new MailMessage(
                emailSettings.MailFromAddress, // From
                emailSettings.MailToAddress, // To
                "New order submitted!", // Subject
                body.ToString()); // Body

                if (emailSettings.WriteAsFile)
                {
                    mailMessage.BodyEncoding = Encoding.ASCII;
                }
                smtpClient.Send(mailMessage);
            }
        }
        public ViewResult Checkout(Cart cart, ShippingDetails shippingDetails)
        {
            if(cart.Lines.Count() == 0)
            {
                ModelState.AddModelError("", "Sorry, your cart is empty");
            }

            if(ModelState.IsValid)
            {
                orderProcessor.ProcessOrder(cart, shippingDetails);
                cart.clear();
                return View("Completed");
            }
            else
            {
                return View(shippingDetails);
            }
        }