What I'm doing wrong, I need to register new customer with billing information on one page and that on second page to display this billing address but TransactionLibrary.GetBasket().PurchaseOrder.BillingAddress is always null? My Razor code is:

string firstName = inputFirstName.Value;

            string lastName = inputLastName.Value;

            string email = inputEmail.Value;

            string phone = inputPhone.Value;

            string mobile = inputMobile.Value;

            string zip = inputZip.Value;

            string city = inputTown.Value;

            string company = inputHouse.Value;

            string address1 = inputAddress1.Value;

            string address2 = inputAddress2.Value;

            ////get a membertype by its alias

            var mt = umbraco.cms.businesslogic.member.MemberType.GetByAlias(MemberTypeAlias); //needs to be an existing membertype            

            ////get the user(0)

            var user = new umbraco.BusinessLogic.User(0);

            ////create a new member with Member.MakeNew

            var member = umbraco.cms.businesslogic.member.Member.MakeNew(string.Format("{0} {1}", inputFirstName.Value, inputLastName.Value), inputEmail.Value, mt, user);

           ////password and loginname

            member.Password = inputPassword.Value;

            member.LoginName = inputEmail.Value;

            ////asssign a group, get the group by name, and assign its Id

            var group = umbraco.cms.businesslogic.member.MemberGroup.GetByName(MemberGroupName); //needs to be an existing MemberGroup

            member.AddGroup(group.Id);

            ////generate the member xml with .XmlGenerate

            member.XmlGenerate(new System.Xml.XmlDocument());

            ////add the member to the website cache to log the member in

            umbraco.cms.businesslogic.member.Member.AddMemberToCache(member);

 

            int countryId = int.TryParse(ddlCounry.SelectedValue, out countryId) ? countryId : 0;

            Country country = Country.Get(countryId);

            if (TransactionLibrary.HasBasket())

           {                

                var basketPurchaseOrder = UCommerce.Runtime.SiteContext.Current.OrderContext.GetBasket().PurchaseOrder;

                var address = basketPurchaseOrder.BillingAddress ?? new OrderAddress();

                address.AddressName = "Billing";

                address.FirstName = firstName;

                address.LastName = lastName;

                address.EmailAddress = email;

                address.PhoneNumber = phone;

                address.MobilePhoneNumber = mobile;

                address.CompanyName = company;

                address.Line1 = address1;

                address.Line2 = address2;

                address.PostalCode = zip;

                address.City = city;

                address.State = "";

                address.Country = country;// Country.FirstOrDefault(x => x.Name == "Great Britain");

                address.PurchaseOrder = basketPurchaseOrder;

                Customer customer = Customer.Create(address);

                basketPurchaseOrder.Customer = customer;

                basketPurchaseOrder.BillingAddress = address;

                basketPurchaseOrder.Save(); // Saves cascade to children, so the address is saved as well                

            }                           

                var availableBillingMethods = TransactionLibrary.GetPaymentMethods(country);

                PaymentMethod paymentMethod = availableBillingMethods != null ? availableBillingMethods.FirstOrDefault() : null;

                if (paymentMethod != null)

                {

                    TransactionLibrary.CreatePayment(paymentMethod.Id, requestPayment: false);                     TransactionLibrary.ExecuteBasketPipeline();

               }                

                var currentLanguage = System.Globalization.CultureInfo.CurrentUICulture.TwoLetterISOLanguageName.ToLower();

                Response.Redirect(string.Format("/{0}/shop/preview", currentLanguage));