private void DisplayMap_Load(object sender, EventArgs e)
        {
            winformsMap1.MapUnit = GeographyUnit.Meter;
            winformsMap1.BackgroundOverlay.BackgroundBrush = new GeoSolidBrush(GeoColor.GeographicColors.ShallowOcean);

            GoogleMapsOverlay googleMapsOverlay = new GoogleMapsOverlay();
            googleMapsOverlay.TileCache = new FileBitmapTileCache(@"c:\temp\a");
            googleMapsOverlay.TileCache.CacheId = "good";
            googleMapsOverlay.MapType = GoogleMapsMapType.Satellite;

            winformsMap1.Overlays.Add(googleMapsOverlay);
            winformsMap1.CurrentExtent = new RectangleShape(-10000000, 10000000, 10000000, -10000000);
            winformsMap1.Refresh();
        }