Parsing Json gMaps Api in windows Phone 8 using Serialization - json

Question

I Have json file :
Google Maps Api - place Json
I want Parsing Json using System.Runtime.Serialization;
I can create 3 class :
public class Places
{
[DataMember(Name = "geometry")]
public string Geometry
{
get;
set;
}
[DataMember(Name = "location")]
public string Location { get; set; }
[DataMember(Name = "lat")]
public string Latitude { get; set; }
[DataMember(Name = "lng")]
public string Longitude { get; set; }
[DataMember(Name = "icon")]
public string Icon { get; set; }
[DataMember(Name = "id")]
public string Id { get; set; }
[DataMember(Name = "name")]
public string Name { get; set; }
[DataMember(Name = "photo")]
public string Photo { get; set; }
[DataMember(Name = "rating")]
public string Rating { get; set; }
[DataMember(Name = "reference")]
public string Reference { get; set; }
[DataMember(Name = "types")]
public string Types { get; set; }
[DataMember(Name = "vicinity")]
public string Vicinity { get; set; }
}
public class AppConstants
{
public static String baseUri = "https://maps.googleapis.com/maps/api/place/search/json?location=";
}
public class PlaceToMap
{
public GeoCoordinate Coordinate { get; set; }
public string Info { get; set; }
}
[DataContract]
public class PlacesList
{
[DataMember(Name ="results")]
public List<Places> PlaceList { get; set; }
}
MainPage.xaml.cs :
private void updateMap(PlacesList googlePlaceApiRespone)
{
int totalRecords = googlePlaceApiRespone.PlaceList.Count();
try
{
ObservableCollection<PlaceToMap> placeToMapObjs = new ObservableCollection<PlaceToMap>();
for (int index = 0; index < totalRecords; index++)
{
placeToMapObjs.Add(new PlaceToMap()
{
Coordinate = new GeoCoordinate(Convert.ToDouble(googlePlaceApiRespone.PlaceList.ElementAt(index).Latitude),
Convert.ToDouble(googlePlaceApiRespone.PlaceList.ElementAt(index).Longitude)),
Info = googlePlaceApiRespone.PlaceList.ElementAt(index).Name + Environment.NewLine + googlePlaceApiRespone.PlaceList.ElementAt(index).Vicinity
});
}
ObservableCollection<DependencyObject> children = MapExtensions.GetChildren(myMap);
var obj = children.FirstOrDefault(x => x.GetType() == typeof(MapItemsControl)) as MapItemsControl;
obj.ItemsSource = placeToMapObjs;
myMap.SetView(new GeoCoordinate(Convert.ToDouble(currentLatitude), Convert.ToDouble(currentLongitude)), 16);
}
catch (Exception)
{
}
}
But can't no show in pushpin.
toolkit:Pushpin GeoCoordinate="{Binding Coordinate}" Content="{Binding Info}"