// Add the gift card code to the checkout and update the order summary when the request completes. private void AddGiftCardCode(string giftCardCode) { ShowLoadingDialog(Resource.String.syncing_data); SampleApplication.AddGiftCard(giftCardCode, delegate { DismissLoadingDialog(); UpdateOrderSummary(); }, delegate { DismissLoadingDialog(); Toast.MakeText(this, GetString(Resource.String.gift_card_error, giftCardCode), ToastLength.Long).Show(); }); }