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Civil 3D .NET API
qAutodesk::Civil::DatabaseServices Namespace
qAutodesk::Civil::Land Namespace
qAutodesk::Civil::PipeNetwork Namespace
qAutodesk::Civil::Roadway Namespace
qAutodesk::Civil::Runtime Namespace
qAutodesk::Civil::Settings Namespace
qAutodesk::Civil::Survey Namespace
Ok, let’s now focus on only the new .NET API.

NET API  allows us to write extensions to AutoCAD Civil 3D in any .NET language.

In general, the AutoCAD Civil 3D.NET API performs significantly faster than the COM API. Development requires Microsoft Visual Studio 2008 SP1.

Where possible, you should use the Civil .NET API instead of the COM API, especially for longer operations, as the .NET API is a thin layer to Civil objects and has better performance. However, the COM API is more mature and has more functionality. You may find you need to use the COM object to access some functionality or object members that are not yet exposed by the .NET API.