How to import, View, export the files of format dwg and STP using c# in WPF Application?

Question

We have tried

Aspose.3d Anycad Aspose.Cad Helix Toolkit LibreCad Libre DWG Teigha Cad.NET Opencascade

But we dont want to convert the files in other formats like jpg,tiff,pdf,svg or any format other than dwg and step Need to retain the format as it is..

Appreciating the help Thanks..

3d & 2D ViewPort showing the imported files without converting the files into other formats