Reversing UseShipping and UseBilling address radio btns

[voir]

Depending on the contents of the cart I need to change the default checked button when selecting between Use Billing and Use Shipping address on checkout. When I tried it seemed to work but then checkout halts at the point someone enters their gift card number or credit card number, being redirected to a blank billing address screen. Can anyone help

OnePageCheckout Conlib

Code: Select all

        
        //MAKE SURE THERE ARE ITEMS IN THE BASKET
        Basket basket = Token.Instance.User.Basket;
        bool hasItems = false;

        foreach (BasketItem item in basket.Items)
        {
            if (item.OrderItemType == OrderItemType.Product)
            {
                hasItems = true;
                break;
            }
        }
        if (!hasItems)
        {
            //THERE ARE NO PRODUCTS, SEND THEN TO SEE EMPTY BASKET
            Response.Redirect(NavigationHelper.GetBasketUrl());
        }

bool SwitchRequired = false;
        
        foreach (BasketItem basketItem in basket.Items)
        {
            BasketItemLicenseAgreementCollection basketItemLicenseAgreements = new BasketItemLicenseAgreementCollection(basketItem, LicenseAgreementMode.OnAddToBasket);
            if ((basketItemLicenseAgreements.Count > 0))
            {
                try
                {
                    foreach (BasketItemInput oii in basketItem.Inputs)
                    {
                        if ((oii.InputField.Name.StartsWith("Buying a Gift")) && (oii.InputValue.StartsWith("Yes")))
                        {
                            SwitchRequired = true;
                        }
                    }
                }
                catch { }

            }
        }
        if (SwitchRequired)
        {
            UseBillingAddress.Checked = false;
            UseShippingAddress.Checked = true;
            UseShippingAddressLabel.Text = "Use Shipping Address (Recommended for Gift Memberships)";
            UseShippingAddressLabel.ToolTip = "If your order contains more than one Gift or shipping destination, use the [Multiple Destinations] button";
        }

Then later

Code: Select all

    private void InitializeShippingAddress()
    {
        //CHECK WHETHER TO SHOW SHIPPING ADDRESS FORM
        if (Request.Form[UseShippingAddress.UniqueID] == "UseBillingAddress")
        {
            
                UseBillingAddress.Checked = true;
                this.ShipToAddressId = -1;
        }
        else if (Request.Form[UseShippingAddress.UniqueID] == "UseShippingAddress")
        {
            UseBillingAddress.Checked = false;
        }
        else
        {
            if (UseShippingAddressLabel.Text.Contains("Gift Memberships"))
            {
                UseBillingAddress.Checked = false;
            }
            else
            {
                UseBillingAddress.Checked = (ShipToAddressId < 0);
            }
        }
        UseShippingAddress.Checked = !UseBillingAddress.Checked;