public PartialViewResult SetBillingAddress()
 {
     ViewData["other-addresses"] = _getExistingAddressOptions.Get(_cart.BillingAddress);
     ViewData["country-options"] = _getCountryOptions.Get();
     return(PartialView(_cart.BillingAddress));
 }
        public List <SelectListItem> GetOtherAddresses()
        {
            Address shippingAddress = _cart.ShippingAddress ?? new Address();

            return(_getExistingAddressOptions.Get(shippingAddress));
        }