We have just posted a video on the new Surface .NET API in AutoCAD Civil 3D 2012. The recoded video and the associated API samples are available for download from the link below -
Video : AutoCAD Civil 3D 2012 Surface .NET API
Check it out, this might be useful to you!
Autodesk Developer Network
It is cool,can you post dll ?
I am new to programming and if you post dll I can get some idea.
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