How can I convert line to Splineshape in C#

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        public static ISplineShape GetSplineShapeFromINode(IINode node, int t, ref bool deleteIt)
        {
            deleteIt = false;
            IObject obj = node.ObjectRef.Eval(t).Obj;

            if (obj.SuperClassID == SClass_ID.Shape)
            {
                ISplineShape pSplineShape = MaxInterfaces.Global.SplineShape.Marshal(obj.ConvertToType(0, SplineShapeClassID).CollapseObject.NativePointer);
                if (obj != pSplineShape)
                    deleteIt = true;
                return pSplineShape;
            }
            return null;
        }

• This approach does not seem to work