Set text of TextBox coming from Facebook API

Question

I developing an app in which I need to set some data of user from facebook. So using WebAuthentication broker I get the user to login and then fetch the information and set it to the textbox values. The information is fetched properly but the values are
not set in Textbox. I can't figure out the reason. Can somebody help? This is my function for setting the data.
async public void SignUpUsingFacebook(string response)
            if (Utility.isInternetAvailable())
                try { MainPage.StartAnimation();
                MainPage.loaderGrid.Visibility = Visibility.Visible;
                catch
                    setAnimation();
                    StartAnimation();
                    loaderGrid.Visibility = Visibility.Visible;
                string token = response.Substring(response.IndexOf('=') + 1);
                string fbGetInfo = "https://graph.facebook.com/me?access_token=" + token;
                HttpResponseMessage msg = await new HttpClient().GetAsync(new Uri(fbGetInfo), HttpCompletionOption.ResponseContentRead);
                if (msg.IsSuccessStatusCode)
                    try
                        string fbData = await msg.Content.ReadAsStringAsync();
                        JObject j = JObject.Parse(fbData);
                        string fbId = j["id"].ToString();
                        txt_user_Name.Text = fbId;
                        txt_user_Name.Visibility = Visibility.Collapsed;
                        txt_first_Name.Text = j["first_name"].ToString();
                        txt_last_Name.Text = j["last_name"].ToString();
                        txt_email_Address.Text = j["email"].ToString();
                        txt_retype_email_Address.Text = j["email"].ToString();
                        gender = j["gender"].ToString();
                        if (gender.Equals("male", StringComparison.OrdinalIgnoreCase) || gender.Equals("boy", StringComparison.OrdinalIgnoreCase))
                            boy.Visibility = Visibility.Collapsed;
                            boySelected.Visibility = Visibility.Visible;
                            girlSelected.Visibility = Visibility.Collapsed;
                            girl.Visibility = Visibility.Visible;
                        else if (gender.Equals("female", StringComparison.OrdinalIgnoreCase) || gender.Equals("girl", StringComparison.OrdinalIgnoreCase))
                            girlSelected.Visibility = Visibility.Visible;
                            boySelected.Visibility = Visibility.Collapsed;
                            girl.Visibility = Visibility.Collapsed;
                            boy.Visibility = Visibility.Visible;
                    catch { }
                    try { MainPage.loaderGrid.Visibility = Visibility.Collapsed;
                    MainPage.StopAnimation();
                    catch
                        loaderGrid.Visibility = Visibility.Collapsed;
                        StopAnimation();
                else
                    Utility.notifyUser("Your information from facebook could not be fetched", "");
            else
                Utility.showMessage(Utility.msgType.InternetError);

Answer 1

The WebAuthenticationBroker has nothing to do with the issue of your textboxes not showing the values they were set to show.
You are basically just setting string values to textboxes on your page. This shouldn't fail unless you are doing something else that is invalidating the values. Are you setting the values on a different page and viewing the changes on another?
Abdulwahab Suleiman