gistfile1.cs

 public class BingMapLink : Link
    {

        public BingMapLink()
        {

            Target = new Uri("http://dev.virtualearth.net/REST/v1/Imagery/Map/Road/{lat},{long}/{level}?mapSize={mapsize}&key={apikey}");
            SetParameter("level", 10);
            SetParameter("mapsize", "500, 500");
        }

        public void SetCoordinates(double latitude, double longitude)
        {
            SetParameter("lat", latitude.ToString());
            SetParameter("long", longitude.ToString());
        }
        public void SetMapSize(int height, int width)
        {
            SetParameter("mapsize", string.Format("{0},{1}",height,width));
        }

        public void SetApiKey(string key)
        {
            SetParameter("apikey", key);
        }
        public void SetLevel(int level)
        {
            SetParameter("level", level.ToString());
        }
    }