How To Do
Can I read/write DWG files with DXFReader.NET?
DXFReader.NET is able to manage only standard DXF files form release 2 to 2018 in ASCII and binary format.
If you need to read/write DWG files you can use the "ODA DWG-DXF Converter" from Open Design Alliance.
The converter utility converts files back and forth between DWG and DXF formats and accepts wildcard filenames and can be used for batch processing.
You can download The "ODA DWG-DXF Converter" utility clicking here.
Download C# code sample from GitHub