winformsMap1.MapUnit = GeographyUnit.Meter;
            winformsMap1.BackgroundOverlay.BackgroundBrush = new GeoSolidBrush(GeoColor.StandardColors.Snow);

            ClassBreakStyle gridClassBreakStyle = new ClassBreakStyle("CellValue");
            gridClassBreakStyle.ClassBreaks.Add(new ClassBreak(double.MinValue, new AreaStyle(new GeoSolidBrush(GeoColor.SimpleColors.Transparent))));
            gridClassBreakStyle.ClassBreaks.Add(new ClassBreak(100, new AreaStyle(new GeoSolidBrush(GeoColor.FromArgb(100, 255, 0, 0)))));
            gridClassBreakStyle.ClassBreaks.Add(new ClassBreak(200, new AreaStyle(new GeoSolidBrush(GeoColor.FromArgb(100, 255, 128, 0)))));
            gridClassBreakStyle.ClassBreaks.Add(new ClassBreak(300, new AreaStyle(new GeoSolidBrush(GeoColor.FromArgb(100, 245, 210, 10)))));
            gridClassBreakStyle.ClassBreaks.Add(new ClassBreak(500, new AreaStyle(new GeoSolidBrush(GeoColor.FromArgb(100, 225, 255, 0)))));
            gridClassBreakStyle.ClassBreaks.Add(new ClassBreak(800, new AreaStyle(new GeoSolidBrush(GeoColor.FromArgb(100, 224, 251, 132)))));
            gridClassBreakStyle.ClassBreaks.Add(new ClassBreak(1000, new AreaStyle(new GeoSolidBrush(GeoColor.FromArgb(100, 128, 255, 128)))));
            gridClassBreakStyle.ClassBreaks.Add(new ClassBreak(2000, new AreaStyle(new GeoSolidBrush(GeoColor.FromArgb(100, 0, 255, 0)))));

            GridFeatureLayer gridFeatureLayer = new GridFeatureLayer(@"C:\temp\Inputs2\IWD_1000m.grd");
            //GridFeatureLayer gridFeatureLayer = new GridFeatureLayer(@"C:\temp\Inputs2\IWD_1000m_NoEmpty.grd");
            gridFeatureLayer.Open();
            gridFeatureLayer.ZoomLevelSet.ZoomLevel01.CustomStyles.Add(gridClassBreakStyle);
            gridFeatureLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

            LayerOverlay staticOverlay = new LayerOverlay();
            staticOverlay.Layers.Add("GridFeatureLayer", gridFeatureLayer);
            winformsMap1.Overlays.Add(staticOverlay);
            winformsMap1.CurrentExtent = gridFeatureLayer.GetBoundingBox();

            System.Diagnostics.Stopwatch stopwatch = new System.Diagnostics.Stopwatch();
            stopwatch.Start();
            winformsMap1.Refresh();
            stopwatch.Stop();

            System.Diagnostics.Debug.WriteLine(stopwatch.Elapsed.TotalMilliseconds);