public async void ReturnProduct(ProductItemCart productItem) { //TEST INTERNET CONNECTTION var httpClient = new HttpClient(); string x = ""; try { var testInternet = await httpClient.GetStringAsync(ServerDatabase.localhost + "store/getstorebyid/test"); x = testInternet; } catch (Exception ex) { await App.Current.MainPage.DisplayAlert("Error", "Action fail, check your internet connection and try again!", "OK"); return; } Product product = productItem.Product; Product deletedProduct = dataProvider.GetProductInCartByIDSourceProduct(product.IDSourceProduct); DataUpdater.ReturnProductToSourceProduct(deletedProduct); Product changedProduct = dataProvider.GetProductByID(product.IDSourceProduct); using (UserDialogs.Instance.Loading("wait..")) { //Update lại product cho server database await httpClient.PostAsJsonAsync(ServerDatabase.localhost + "product/update", changedProduct); //xóa product bị hủy trong cart await httpClient.PostAsJsonAsync(ServerDatabase.localhost + "product/deleteproductbyid/" + deletedProduct.IDProduct, new { }); //load lại data product cho store được trả về VÀ TRONG CART DataUpdater.DeletedProductInCart(deletedProduct); LoadData(); } //PUSH NOTI List <Product> productForPushNoti = new List <Product>(); productForPushNoti.Add(changedProduct); productForPushNoti.Add(deletedProduct); string datas = PushNotificationService.ConvertDataReturnProductCart(productForPushNoti); PushNotificationService.Push(NotiNumber.ReturnProductCart, datas, true); }