CAD Import .NET is an easy-to-use API for reading AutoCAD DWG and DXF in C#, VB.NET, J# and Delphi .NET applications. It is completely programmed in C# and supports the following entities:
3dFace
Arc
Attdef
Block
BlockRecord
Circle...
Platform:
Windows 95, Windows 98, Windows NT, Windows 2000, Windows XP, Windows 2003, Pocket PC