How Create Insulation Detail Lines by REVIT API ? (Insulation / annotation)

[Anonymous]

            GraphicsStyle solid_wt_6 = LinesCat.GetGraphicsStyle(GraphicsStyleType.Projection);
            geomLine = Line.CreateBound(start, end);
           
            Transaction transaction = new Transaction(document, "Detail Lines example");
            if (transaction.Start() == TransactionStatus.Started)
            {
                 DetailLine detailline = document.Create.NewDetailCurve(view, geomLine) as DetailLine;

                detailline.LineStyle = solid_wt_6;

                if (null == detailline)
                {
                    throw new Exception("Create a new straight grid failed.");
                }

                 transaction.Commit();
               
                Curve curve = detailline.GeometryCurve as Curve;

            }

How can I make it?

I wrote the code, but it didn't work. Which part is wrong?