private void DisplayMap_Load(object sender, EventArgs e)
        {
            winformsMap1.MapUnit = GeographyUnit.DecimalDegree;

            ShapeFileFeatureLayer majorCit = new ShapeFileFeatureLayer(@"..\..\sampledata\data\majorcities.shp");
            majorCit.Open();
            majorCit.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = PointStyles.City1;
            majorCit.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

            ShapeFileFeatureLayer worldCapitals = new ShapeFileFeatureLayer(@"..\..\sampledata\data\worldcapitals.shp");
            worldCapitals.Open();
            worldCapitals.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = PointStyles.Capital1;
            worldCapitals.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

            PointShape pointInMajorCit = majorCit.FeatureSource.GetFeatureById("5", ReturningColumnsType.NoColumns).GetShape() as PointShape;
            PointShape pointInWorldCapitals = worldCapitals.FeatureSource.GetFeatureById("15", ReturningColumnsType.NoColumns).GetShape() as PointShape;

            LineShape line = new LineShape();
            line.Vertices.Add(new Vertex(pointInMajorCit));
            line.Vertices.Add(new Vertex(pointInWorldCapitals));

            InMemoryFeatureLayer inmLayer = new InMemoryFeatureLayer();
            inmLayer.ZoomLevelSet.ZoomLevel01.DefaultLineStyle = LineStyles.Canal1;
            inmLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
            inmLayer.InternalFeatures.Add(new Feature(line));


            LayerOverlay ov = new LayerOverlay();
            ov.Layers.Add(majorCit);
            ov.Layers.Add(worldCapitals);
            ov.Layers.Add(inmLayer);

            winformsMap1.Overlays.Add(ov);
            winformsMap1.CurrentExtent = new RectangleShape(-180, 90, 180, -90);
            winformsMap1.Refresh();
        }