Draw the route at runtime - bing-maps

Question

I have an app with Bing Maps and I need to draw the route of the user dinamically.
Now I can only trace the user position with a pushpin. Is there some method to draw route?
UPDATE 1:
I'm using this handler assigned to geolocator.positionChanged:
private void geolocator_DrawRoute(Geolocator sender, PositionChangedEventArgs args)
{
// Need to get back onto UI thread before updating location information
this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, new DispatchedHandler(
() =>
{
//Get the current location
Location location = new Location(args.Position.Coordinate.Point.Position.Latitude,
args.Position.Coordinate.Point.Position.Longitude);
_rotta.Add(location);
if (_rotta.Count > 1)
{
var polyline = new MapPolyline { Locations = _rotta, Color = Colors.Blue, Width = 3 };
_shapeLayer.Shapes.Add(polyline);
}
//Update the position of the GPS pushpin
MapLayer.SetPosition(GpsPushpin, location);
//Update the map view to the current GPS location
MyMap.SetView(location, 18);
}));
}
UPDATE 2:
private void geolocator_DrawRoute(Geolocator sender, PositionChangedEventArgs args)
{
// Need to get back onto UI thread before updating location information
Dispatcher.RunAsync(CoreDispatcherPriority.Normal, new DispatchedHandler(
() =>
{
//Get the current location
var location = new Location(args.Position.Coordinate.Point.Position.Latitude, args.Position.Coordinate.Point.Position.Longitude);
_rottaLoc.Add(location);
if (_rotta == null)
{
_rotta = new MapPolyline { Locations = _rottaLoc, Color = Colors.Blue, Width = 4 };
}
else
{
_rotta.Locations = _rottaLoc;
}
_shapeLayer.Shapes.Add(_rotta);
//Update the position of the GPS pushpin
MapLayer.SetPosition(GpsPushpin, location);
//Update the map view to the current GPS location
MyMap.SetView(location, 18);
}));
}

Answer 1

To do this the first step would be to get the users position. If you are using JavaScript you can use the Geolocation API to get the users location and to monitor them as they move. Here is some documentation on how to do this: http://www.html5rocks.com/en/tutorials/geolocation/trip_meter/
Once you have this done you can show the users location fairly easily. If you want to draw a polyline to should their path then what you can do is the first time users position is grabbed you can create a polyline object where the first and second coordinate are this first coordinate. You can then add the polyline to the map. The next time the users location is grabbed you can simply add this new location to the polyline's array of locations.