winformsMap1.MapUnit = GeographyUnit.DecimalDegree;

            Feature line1 = new Feature("LINESTRING (100 100, 20 180)");
            line1.ColumnValues["id"] = "1";

            Feature line2 = new Feature("LINESTRING (100 80, 20 160)");
            line2.ColumnValues["id"] = "2";

            ValueItem valueItem1 = new ValueItem("1", LineStyles.Canal1);
            ValueItem valueItem2 = new ValueItem("2", LineStyles.Highway1);

            ValueStyle valueStyle = new ValueStyle();
            valueStyle.ColumnName = "id";
            valueStyle.ValueItems.Add(valueItem1);
            valueStyle.ValueItems.Add(valueItem2);

            InMemoryFeatureLayer inmLayer = new InMemoryFeatureLayer();
            inmLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
            inmLayer.ZoomLevelSet.ZoomLevel01.CustomStyles.Add(valueStyle);
            inmLayer.InternalFeatures.Add(line1);
            inmLayer.InternalFeatures.Add(line2);
            inmLayer.Open();
            inmLayer.Columns.Add(new FeatureSourceColumn("id"));
            inmLayer.Close();

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

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