public static void Plan2AufteilungNet()
        {
            var acadApp = (Autodesk.AutoCAD.Interop.AcadApplication)_AcAp.Application.AcadApplication;

            _AcAp.Document doc = _AcAp.Application.DocumentManager.MdiActiveDocument;
            _AcDb.Database db  = doc.Database;
            _AcEd.Editor   ed  = doc.Editor;
            try
            {
                ed.Command("_.LAYER", "_TH", "*", "_ON", "*", "_UN", "*", "");
                var selOp = new _AcEd.PromptSelectionOptions();
                selOp.MessageForAdding = "Zu verschiebende Elemente wählen: ";
                _AcEd.SelectionFilter filter = new _AcEd.SelectionFilter(new _AcDb.TypedValue[] {
                    new _AcDb.TypedValue((int)_AcDb.DxfCode.Operator, "<NOT"),
                    new _AcDb.TypedValue((int)_AcDb.DxfCode.Operator, "<AND"),
                    new _AcDb.TypedValue((int)_AcDb.DxfCode.Start, "*POLYLINE"),
                    new _AcDb.TypedValue((int)_AcDb.DxfCode.LayerName, "A_AL_MANSFEN"),
                    new _AcDb.TypedValue((int)_AcDb.DxfCode.Operator, "AND>"),
                    new _AcDb.TypedValue((int)_AcDb.DxfCode.Operator, "NOT>")
                });
                while (true)
                {
                    var res = ed.GetSelection(selOp, filter);
                    if (res.Status != _AcEd.PromptStatus.OK)
                    {
                        break;
                    }
                    else
                    {
                        var            ss     = res.Value;
                        var            selOpE = new _AcEd.PromptSelectionOptions();
                        _AcDb.ObjectId mf1    = default(_AcDb.ObjectId);
                        if (!GetMansfen("Quell-Mansfen wählen: ", ref mf1))
                        {
                            break;
                        }
                        _AcDb.ObjectId mf2 = default(_AcDb.ObjectId);
                        if (!GetMansfen("Ziel-Mansfen wählen: ", ref mf2))
                        {
                            break;
                        }

                        if (!SameMansfens(mf1, mf2))
                        {
                            ed.WriteMessage("\nDie gewählten Mansfens sind nicht identisch!");
                            System.Windows.Forms.MessageBox.Show("\nDie gewählten Mansfens sind nicht identisch!", "Plan2AufteilungNet");
                        }
                        else
                        {
                            _AcGe.Point3d fromPoint = GetLuPoint(mf1);
                            _AcGe.Point3d toPoint   = GetLuPoint(mf2);

                            string dwgName     = doc.Name;
                            var    dwgProposal = System.IO.Path.Combine(System.IO.Path.GetDirectoryName(dwgName), System.IO.Path.GetFileNameWithoutExtension(dwgName) + "_X.dwg");
                            _AcWnd.SaveFileDialog             sfd = new _AcWnd.SaveFileDialog("Ziel-Zeichnung", dwgProposal, "dwg", "TargetDrawing", _AcWnd.SaveFileDialog.SaveFileDialogFlags.NoFtpSites);
                            System.Windows.Forms.DialogResult dr  = sfd.ShowDialog();
                            if (dr == System.Windows.Forms.DialogResult.OK)
                            {
                                var ucs        = ed.CurrentUserCoordinateSystem;
                                var fromPointU = Globs.TransWcsUcs(fromPoint); // fromPoint.TransformBy(ucs);
                                var toPointU   = Globs.TransWcsUcs(toPoint);   // toPoint.TransformBy(ucs);


                                // only acad2015 -
                                ed.Command("_.UNDO", "_M");

                                ed.Command("_.DIMDISASSOCIATE", ss, "");

                                ed.Command("_.MOVE", ss, "", fromPointU, toPointU);
                                //ed.Command("_.MOVE", ss, "", "0,0", "100,100");
                                ed.Command("_.ERASE", "_ALL", "_R", ss, mf2, "");

                                doc.Database.SaveAs(sfd.Filename, false, _AcDb.DwgVersion.Current, doc.Database.SecurityParameters);

                                ed.Command("_.UNDO", "_B");
                                //doc.SendStringToExecute("._UNDO B", true, false, true);
                                // also supports acad2013
                                doc.SendStringToExecute(".'_UNDO M ", true, false, true);
                                //acadApp.ActiveDocument.SendCommand("_.UNDO _M\n");
                                //acadApp.ActiveDocument.SendCommand("_.DIMDISASSOCIATE _P \n");
                            }
                        }

                        Globs.HightLight(mf1, onOff: false);
                        Globs.HightLight(mf2, onOff: false);
                    }
                }
            }
            catch (System.Exception ex)
            {
                string msg = string.Format(CultureInfo.CurrentCulture, "Fehler in (Plan2AufteilungNet): {0}", ex.Message);
                ed.WriteMessage("\n" + msg);
                System.Windows.Forms.MessageBox.Show(ex.Message, "Plan2AufteilungNet");
            }
        }