Feature feature;
        InMemoryFeatureLayer inmLayer;
        private void DisplayMap_Load(object sender, EventArgs e)
        {
            winformsMap1.MapUnit = GeographyUnit.DecimalDegree;
            winformsMap1.Overlays.Add(new WorldMapKitWmsDesktopOverlay());


            feature = new Feature(0, 0);

             inmLayer = new InMemoryFeatureLayer();
            inmLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
            inmLayer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = PointStyles.Capital1;
            inmLayer.InternalFeatures.Add(feature);

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

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

            Timer timer = new Timer();
            timer.Interval = 100;
            timer.Tick += new EventHandler(timer_Tick);
            timer.Enabled = true;
        }

        void timer_Tick(object sender, EventArgs e)
        {
            Random random = new Random();
            feature = new Feature(random.Next(-180, 180), random.Next(-90, 90));
            inmLayer.InternalFeatures.Clear();
            inmLayer.InternalFeatures.Add(feature);
            winformsMap1.Refresh();
        }