        private void DrawMarkerOverlays(DataTable dt, ValueMarkerStyle myValueStyle)
        {
            DataView dv = dt.DefaultView;

            //Assertion does not fail so they are the same.
            Debug.Assert(dv.Count == dt.Rows.Count);
            IEnumerator iterator = dv.GetEnumerator();

            DataRowView drv;
            System.Int32 i = 0;

            string lon = string.Empty;
            string lat = string.Empty;
            Double dlon = 0.0;
            Double dlat = 0.0;
            string desc = string.Empty;
            int state = 0;

            while (iterator.MoveNext())
            {
                drv = (DataRowView)iterator.Current;

                lon = drv.Row["lLongitude"].ToString();
                lat = drv.Row["lLatitude"].ToString();

                if (VerifyLatLon(lat, lon))
                {
                    dlon = Convert.ToDouble(drv.Row["lLongitude"]);
                    dlat = Convert.ToDouble(drv.Row["lLatitude"]);
                    desc = drv.Row["szSiteDesc"].ToString();

                    CreateValueMarker(state,
                        myValueStyle,
                        dlon,
                        dlat,
                        desc);

                    AppendFeatures(Map1.MarkerOverlay,
                        state.ToString(),
                        dlon,
                        dlat);

                }
                i++;
            }
        }


        private void CreateValueMarker(Int32 state, ValueMarkerStyle vmStyle, double lon, double lat, string hoverText)
        {
            switch (state)
            {
                case 0:
                    vmStyle.ValueItems.Add(new MarkerValueItem(state.ToString(),
                        new PointMarkerStyle(new WebImage("/CrossingsMap/theme/default/img/marker_green.gif", 25, 25, -11.5F, -25F),
                            CreatePopup(CreateKey(lat), lon, lat, hoverText),
                            CreateContext(CreateKey(lat), lon, lat))));
                    break;
                case 1:
                    vmStyle.ValueItems.Add(new MarkerValueItem(state.ToString(),
                        new PointMarkerStyle(new WebImage("/CrossingsMap/theme/default/img/marker.gif", 25, 25, -11.5F, -25F),
                            CreatePopup(CreateKey(lat), lon, lat, hoverText),
                            CreateContext(CreateKey(lat), lon, lat))));
                    break;
                case 2:
                    vmStyle.ValueItems.Add(new MarkerValueItem(state.ToString(),
                        new PointMarkerStyle(new WebImage("/CrossingsMap/theme/default/img/marker_grey.gif", 25, 25, -11.5F, -25F),
                            CreatePopup(CreateKey(lat), lon, lat, hoverText),
                            CreateContext(CreateKey(lat), lon, lat))));
                    break;
                default:
                    break;
            }
        }

        private CustomPopup CreatePopup(string key, double lon, double lat, string hoverText)
        {
            try
            {
                CustomPopup popup = new CustomPopup();

                StringBuilder contentHtml = new StringBuilder();
                //contentHtml.Append("<div style='padding:10px; font-size:10px; font-family:verdana;'>")
                contentHtml.Append("<span class='popup'>")
                    .Append(hoverText) 
                    .Append("</span>");

                popup.ContentHtml = contentHtml.ToString();
                popup.AutoSize = true;
                popup.BorderWidth = 1;
                popup.IsVisible = false;
                popup.AutoPan = true;
                Map1.MarkerOverlay.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
                return popup;
            }
            catch
            {
                return null;
            }
        } 