WP - เกี่ยวกับการเขียนโปรแกรมสร้างแผนที่ในแอปพลิเคชัน windows phone 8

public partial class NearMapPage : PhoneApplicationPage
    {
        

        public NearMapPage()
        {
            InitializeComponent();          

            ShowMyLocationOnTheMap();


            Map MyMap = new Map();
            MyMap.Center = new GeoCoordinate(47.6097, -122.3331);
            MyMap.ZoomLevel = 12;
            MyMap.LandmarksEnabled = true;
            MyMap.PedestrianFeaturesEnabled = true;
            ContentPanel.Children.Add(MyMap);  
        }
        

        //ApplicationId and AuthenticationToken properties after the first Map control has been loaded        
        private void myMapControl_Loaded(object sender, RoutedEventArgs e)
        {
            Microsoft.Phone.Maps.MapsSettings.ApplicationContext.ApplicationId = "ApplicationId";
            Microsoft.Phone.Maps.MapsSettings.ApplicationContext.AuthenticationToken = "AuthenticationToken";
        }

       

        private void ApplicationBarSearchButton_click(object sender, EventArgs e)
        { }

      

//near1
        private async void ShowMyLocationOnTheMap()
        {
            // Get my current location.
            Geolocator myGeolocator = new Geolocator();
            Geoposition myGeoposition = await myGeolocator.GetGeopositionAsync();
            Geocoordinate myGeocoordinate = myGeoposition.Coordinate;
            GeoCoordinate myGeoCoordinate = CoordinateConverter.ConvertGeocoordinate(myGeocoordinate);


            // Make my current location the center of the Map.
            this.mapWithMyLocation.Center = myGeoCoordinate;
            this.mapWithMyLocation.ZoomLevel = 16;


            // Create a small circle to mark the current location.
            Ellipse myCircle1 = new Ellipse();
            myCircle1.Fill = new SolidColorBrush(Colors.Blue);
            myCircle1.Height = 20;
            myCircle1.Width = 20;
            myCircle1.Opacity = 50;

            // Create a MapOverlay to contain the circle.
            MapOverlay myLocationOverlay = new MapOverlay();
            myLocationOverlay.Content = myCircle1;
            myLocationOverlay.PositionOrigin = new Point(0.5, 0.5);
            myLocationOverlay.GeoCoordinate = myGeoCoordinate;

            
            // Create a MapLayer to contain the MapOverlay.
            MapLayer myLocationLayer = new MapLayer();
            myLocationLayer.Add(myLocationOverlay);
            

            // Add the MapLayer to the Map.
            mapWithMyLocation.Layers.Add(myLocationLayer);
        }



        private async void ApplicationBarRouteButton_click(object sender, EventArgs e)
        {


            // Create a small circle to mark the current location.
            Ellipse myCircle2 = new Ellipse();
            myCircle2.Fill = new SolidColorBrush(Colors.Red);
            myCircle2.Height = 20;
            myCircle2.Width = 20;
            myCircle2.Opacity = 50;

            // Create a MapOverlay to contain the circle.
            MapOverlay myLocationOverlay1 = new MapOverlay();
            myLocationOverlay1.Content = myCircle2;
            myLocationOverlay1.PositionOrigin = new Point(0.5, 0.5);
            myLocationOverlay1.GeoCoordinate = new GeoCoordinate(13.728061, 100.777149);

            //RouteQuery 

            // Create a MapLayer to contain the MapOverlay
            MapLayer myLocationLayer = new MapLayer();
            myLocationLayer.Add(myLocationOverlay1);

            // Add the MapLayer to the Map.
            mapWithMyLocation.Layers.Add(myLocationLayer);
        }


    }