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As far as I know, dxf format is vector format, which is not directly supported by the default .NET classes. So you might need to build the DXF structure programmatically to support it in your .NET project. I found some useful information about this here:
http://www.codeproject.com/Articles/156522/DXF-Import-NET-Read-and-View-AutoCAD-Format-Files
Also, I searched internet and found the following forum that might help:
http://support.leadtools.com/SupportPortal/CS/forums/45142/ShowPost.aspx