NatNetML with MONO?

[hangon]

I'm having trouble getting NatNetML.dll working with a mono app. I think mono is still .Net2.0 could there be a problem if the NatNetML.dll uses any NET3.0 or 3.5 feaures, or is compiled for 3.5 assembly?
Creating a new object crashes my app.

private NatNetML.NatNetClientML m_NatNet = new NatNetML.NatNetClientML();
private NatNetML.FrameOfMocapData m_FrameOfData = new NatNetML.FrameOfMocapData();

Thanks for any suggestions.
NatNetSDK2.1

[morgan]

NatNetML is built against the .Net 2.0 runtime using Visual C++ 2005.

Does the standard .NET sample supplied with the NatNet SDK work correctly?