private async void RequestView_OnNavigationCompleted(WebView sender, WebViewNavigationCompletedEventArgs args) { if (args.Uri.DnsSafeHost == "wp.qmatteoq.com") { sender.Visibility = Visibility.Collapsed; AppContent.Visibility = Visibility.Visible; FacebookClient client = new FacebookClient(AccessToken); dynamic result = client.ParseDialogCallbackUrl(args.Uri); if (result.error_code == null) { var items = (IDictionary<string, object>) result; ObservableCollection<FacebookUser> invitedFriends = new ObservableCollection<FacebookUser>(); foreach (KeyValuePair<string, object> value in items) { if (value.Key != "request") { string query = string.Format("/{0}", value.Value); dynamic user = await client.GetTaskAsync(query); FacebookUser facebookUser = new FacebookUser(); facebookUser.FullName = user.name; invitedFriends.Add(facebookUser); } } Friends.Visibility = Visibility.Visible; FriendsHeader.Visibility = Visibility.Visible; Friends.ItemsSource = invitedFriends; } else { MessageDialog dialog = new MessageDialog("The user has canceled the operation"); await dialog.ShowAsync(); } } }