/// <summary>
        /// Populates the page with content passed during navigation.  Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="navigationParameter">The parameter value passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
        /// </param>
        /// <param name="pageState">A dictionary of state preserved by this page during an earlier
        /// session.  This will be null the first time a page is visited.</param>
        protected override async void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
        {
            // Allow saved page state to override the initial item to display
            if (pageState != null && pageState.ContainsKey("SelectedItem"))
            {
                navigationParameter = pageState["SelectedItem"];
            }

            String YWSID = "Bi9Fsbfon92vmD4DkkO4Fg";
            String url;
            if (navigationParameter != null && navigationParameter != "")
            {
                model = (Model)navigationParameter;
            }

            if (model != null)
            {
                url = "http://api.yelp.com/business_review_search?term=food&location=" + model.Location + "&ywsid=" + YWSID;
            }
            else 
            {
                Geolocator locator = new Geolocator();
                Geoposition geoPos = await locator.GetGeopositionAsync();
                Geocoordinate geoCoord = geoPos.Coordinate;
                url = "http://api.yelp.com/business_review_search?term=food&lat=" + geoCoord.Latitude + "&long=" + geoCoord.Longitude + "&ywsid=" + YWSID;
            }

            var httpClient = new HttpClient();
            String content = await httpClient.GetStringAsync(url);
            response = JsonObject.Parse(content);

            if (response.GetNamedArray("businesses").Count == 0)
            {
                if (model != null)
                {
                    model.error = true;
                    GoBack(this, null);
                }
                else
                {
                    this.Frame.Navigate(typeof(LocationEntryPage));
                }
            }
            else
            {
                StopLoading();
                PopulateNewRestaurant();
            }
        }
 private void Button_Click_1(object sender, RoutedEventArgs e)
 {
     model = new Model();
     model.Location = Location.Text;
     this.Frame.Navigate(typeof(MainPage), model);
 }
 public LocationEntryPage()
 {
     this.InitializeComponent();
     this.NavigationCacheMode = NavigationCacheMode.Enabled;
     model = null;
 }
 public MainPage()
 {
     this.InitializeComponent();
     model = null;
     pageTitle.Text = "Restaurant near ";
 }