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

            GeoTiffRasterLayer worldImageLayer = new GeoTiffRasterLayer(@"..\..\sampledata\images\001_raster\gru200.tif");
            worldImageLayer.UpperThreshold = double.MaxValue;
            worldImageLayer.LowerThreshold = 0;
            worldImageLayer.IsGrayscale = false;

            worldImageLayer.Open();
            winformsMap1.CurrentExtent = worldImageLayer.GetBoundingBox();
            worldImageLayer.Close();

            worldImageLayer.KeyColors.Add(new GeoColor(255, 255, 255, 255));
           worldImageLayer.LibraryType = GeoTiffLibraryType.UnmanagedLibTiff;
            LayerOverlay ImageOverlay = new LayerOverlay();
           ImageOverlay.Layers.Add("WorldImageLayer", worldImageLayer);
            winformsMap1.Overlays.Add(ImageOverlay);
            winformsMap1.Refresh();
        }