Dear all, I don't know if it's the right place, but, I connect via C# and automation to AutoCAD, open the DWG successefuly, and want to SaveAs DXF, as I saw on the reference, the method have 3 arguments: 1) path + file -> string 2) file type (in my case DXF) -> as DXF -> object 3) object -> vSecurityParams -> object, don't know what is it How do I pass the last two arguments? (currently the C# throw execption) TIA,