How to add a map marker to map? Windows Phone

Question

I have passed a GeoCoordinate variable to the page of my map class, but when I try to draw a marker to the map I get an error stating that GeoCoordinate is a 'type' but is used as a 'variable' It also gives me syntax error for the ; at PositionOrigin = new Point(0.5, 0.5); and the closing ;.

I understand from this that my syntax must be incorrect for adding a map marker due to getting this error. My question is how do I correct this method to draw the marker? Am I drawing the marker the correct way or is there a different solution?

This is the onNaviagatedTo method of the map page where I pass the coordinates and try to add a marker:

protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            if (NavigationContext.QueryString.ContainsKey("GeoLat") && NavigationContext.QueryString.ContainsKey("GeoLong"))
            {
                var latitude = Convert.ToDouble(NavigationContext.QueryString["GeoLat"]);
                var longtitude = Convert.ToDouble(NavigationContext.QueryString["GeoLong"]);
                var MyGeoPosition = new GeoCoordinate(latitude, longtitude);

                var overlay = new MapOverlay
                {
                    PositionOrigin = new Point(0.5, 0.5); //syntax error
                    GeoCoordinate = MyGeoPosition; //error thrown here
                    Content = new TextBlock{Text = "My car"}; 

                    var ml = new MapLayer { overlay }; 
                    MyMap.Layers.Add(ml);
                }; //syntax error

            }

Answer 1

Looks to me like you're missing an equal sign.

MapOverlay overlay = new MapOverlay()
{
    PositionOrigin = new Point(0.5, 0.5),
    GeoCoordinate = MyGeoPosition,
    Content = new TextBlock{Text = "My car"},
};
MapLayer ml = new MapLayer { overlay };
MyMap.Layers.Add(ml);

Or, you could just do this with PushPins:

PushPin myPin = new Pushpin();
myPin.Location = MyGeoPosition;
myPin.Content = "My car";
MyMap.Children.Add(myPin);