We have not specific documentation for .NET wrappers over Visualize SDK. But the approach is the same as for the other ODA SDKs where the Swig is used for the .NET wrappers. Also, we have a sample application "WpfVisualizeViewer" which demonstrates how to use .NET wrappers of the Visualize SDK.
Please note, that you need the following archives for Visualize .NET: Kernel, Visualize and Visualize .NET.