private void graphicalselection_icon_Click(object sender, EventArgs e)
        {
            if (selectedOrder == -1)
                MessageBox.Show("First Select Appropriate Layer");
            else
            {
                filename1 = themeview1.Items[selectedOrder].ShapeName;

            }
            graphicalselection_icon.Checked = !graphicalselection_icon.Checked;
            if (graphicalselection_icon.Checked == true)
            {
                //Using the rectangle from TrackOverlay to do the spatial query
                winformsMap1.TrackOverlay.TrackMode = TrackMode.Rectangle;

                //Event for getting the rectangle shape at the end of tracking the rectangle on the map.
                winformsMap1.TrackOverlay.TrackEnded += new EventHandler<TrackEndedTrackInteractiveOverlayEventArgs>(winformsMap1_TrackEnded);

                //InMemoryfeatureLayer to show the selected features from the spatial query.
                InMemoryFeatureLayer spatialQueryResultLayer = new InMemoryFeatureLayer();
                spatialQueryResultLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = new AreaStyle(new GeoSolidBrush(GeoColor.FromArgb(200, GeoColor.SimpleColors.PastelRed)));
                spatialQueryResultLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle.OutlinePen.Color = GeoColor.StandardColors.Red;
                spatialQueryResultLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

                LayerOverlay spatialQueryResultOverlay = new LayerOverlay();
                spatialQueryResultOverlay.Layers.Add("SpatialQueryResultLayer", spatialQueryResultLayer);
                winformsMap1.Overlays.Add("SpatialQueryResultOverlay", spatialQueryResultOverlay);

                winformsMap1.Refresh();
            }
            if (graphicalselection_icon.Checked == false)
            {
               
                winformsMap1.Refresh();
		 winformsMap1.TrackOverlay.TrackMode = TrackMode.None;
            }

        }


         void winformsMap1_TrackEnded(object sender, TrackEndedTrackInteractiveOverlayEventArgs e)
        {

            RectangleShape rectangleShape = (RectangleShape)e.TrackShape;
            Collection<string> featureFilenames = new Collection<string>();

            foreach (string filename in openFileDialog.FileNames)
            {

                featureFilenames.Add(filename);

            }

            ShapeFileFeatureLayer worldLayer = (ShapeFileFeatureLayer)winformsMap1.FindFeatureLayer(themeview1.Items[selectedOrder].ShapeName);


            InMemoryFeatureLayer spatialQueryResultLayer = (InMemoryFeatureLayer)winformsMap1.FindFeatureLayer("SpatialQueryResultLayer");

            //Spatial query to find the features intersecting the rectangle from the track rectangle.
            Collection<Feature> spatialQueryResults;
            worldLayer.Open();
            spatialQueryResults = worldLayer.QueryTools.GetFeaturesIntersecting(rectangleShape, ReturningColumnsType.NoColumns);
            worldLayer.Close();

            //Adds the selected features to the InMemoryfeatureLayer
            spatialQueryResultLayer.Open();
            spatialQueryResultLayer.EditTools.BeginTransaction();
            spatialQueryResultLayer.InternalFeatures.Clear();
            foreach (Feature feature in spatialQueryResults)
            {
                spatialQueryResultLayer.EditTools.Add(feature);
            }
            spatialQueryResultLayer.EditTools.CommitTransaction();
            spatialQueryResultLayer.Close();

            //Refreshes the layers to show new result.
            winformsMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Clear();
            winformsMap1.Refresh(winformsMap1.TrackOverlay);
            winformsMap1.Refresh(winformsMap1.Overlays["SpatialQueryResultOverlay"]);
        }


 	private void clearselection_Click(object sender, EventArgs e)
        {
            InMemoryFeatureLayer spatialQueryResultLayer = (InMemoryFeatureLayer)winformsMap1.FindFeatureLayer("spatialQueryResultLayer");


            if (spatialQueryResultLayer.InternalFeatures.Count > 0)
            {
                spatialQueryResultLayer.InternalFeatures.Clear();
            }   
  

        }