public void SaveAsImage(String fileName, ImageFormat imageFormat, int height, int width)
        {
            Bitmap bitmap = new Bitmap(width, height);
            MapEngine mapEngine = new MapEngine
            {
                CurrentExtent =
                    ExtentHelper.GetDrawingExtent(winformsMap1.CurrentExtent, bitmap.Width, bitmap.Height)
            };


            GeoBrush gb = new GeoSolidBrush(new GeoColor(winformsMap1.BackColor.A, winformsMap1.BackColor.R, winformsMap1.BackColor.G, winformsMap1.BackColor.B));
            mapEngine.BackgroundFillBrush = gb;
            if (tsmiMapShowGrid.Checked)
            {
                mapEngine.StaticLayers.Add(_gridLayer);
            }

            foreach (ShapeFileFeatureLayer shapeFileFeatureLayer in _modelLayers)
            {
                mapEngine.StaticLayers.Add(shapeFileFeatureLayer);
            }

            //now add the markers.
            List<int> markerTypeIds = (from CheckBox c in flpMarkerType.Controls where c.Checked select ((MarkerType)c.Tag).IDMarkerType).ToList();
            foreach (int idMarkerType in markerTypeIds)
            {
                MarkerType mt = MarkerTypeHelper.Get(idMarkerType);
                InMemoryFeatureLayer markerLayer = new InMemoryFeatureLayer();
                Image image = ImageHelper.GetMarkerImage(mt);
                var ms = new MemoryStream();
                image.Save(ms, ImageFormat.Png);
                ms.Position = 0;
                markerLayer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = new PointStyle(new GeoImage(ms));
                markerLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

                markerLayer.FeatureSource.Open();
                markerLayer.FeatureSource.BeginTransaction();
                foreach (ThinkGeoMarker item in _markersOverlay.Markers.Where(m => ((Marker)m.Tag).IDMarkerType == idMarkerType))
                {
                    markerLayer.InternalFeatures.Add(new Feature(item.Position));
                }
                markerLayer.FeatureSource.CommitTransaction();
                markerLayer.FeatureSource.Close();
                mapEngine.StaticLayers.Add(markerLayer);
            }

            //now add the cumulative factors.
            foreach (ThinkGeoMarker cumulativeFactor in _modelThinkGeoCumulativeMarkers.Where(m => m.Visible))
            {
                InMemoryFeatureLayer markerLayer = new InMemoryFeatureLayer();
                Panel pnl = (Panel)cumulativeFactor.Controls[0];
                Bitmap bmp = new Bitmap(pnl.Width, pnl.Height);
                pnl.DrawToBitmap(bmp, new Rectangle(0, 0, pnl.Width, pnl.Height));
                var ms = new MemoryStream();
                bmp.Save(ms, ImageFormat.Jpeg);
                ms.Position = 0;
                markerLayer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = new PointStyle(new GeoImage(ms));
                markerLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

                markerLayer.FeatureSource.Open();
                markerLayer.FeatureSource.BeginTransaction();
                markerLayer.InternalFeatures.Add(new Feature(cumulativeFactor.Position));
                markerLayer.FeatureSource.CommitTransaction();
                markerLayer.FeatureSource.Close();
                mapEngine.StaticLayers.Add(markerLayer);
            }

            mapEngine.OpenAllLayers();
            mapEngine.DrawStaticLayers(bitmap, GeographyUnit.DecimalDegree);
            mapEngine.CloseAllLayers();

            bitmap.Save(fileName, imageFormat);
        }