Document doc = Application.DocumentManager.MdiActiveDocument;

            Editor ed = doc.Editor;

            ed.WriteMessage(RXObject.GetClass(typeof(Polyline)).DxfName + "\n");

            ed.WriteMessage(RXObject.GetClass(typeof(Polyline2d)).DxfName + "\n");

            ed.WriteMessage(RXObject.GetClass(typeof(Polyline3d)).DxfName + "\n");