>After building the .NET assembly (with the interop decorators), do I have to register the result unisng regsvr32?

No. .NET Assemblies set up for interop need to be registered with REGASM.EXE.

There's more info here (towards the bottom):
http://www.west-wind.com/presentations/VfpDotNetInterop/DotNetFromVFP.asp

+++ Rick ---

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>>My files are all at home. I'll get something to you later tonight. The Toolkit is basically a wizard that applies the lines needed to make the .Net class COM callable. The wizard only works for VB, but you can manually add the needed COM lines to a C# form and have it work.
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>>You don't add a reference in VFP. The .Net form is a COM component. You'll call it using CREATEOBJECT().
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>>>Thanks for the reply. I have installed it and am trying to follow the examples. I have gotton as far as building the .NET form and registered the interop classes but could you perhaps provide a summary on how to make this work with VFP. For example: What would be the equlivent of adding a reference (I do not see Microsoft InteropForm Toolkit Library) as a COM control? Also, is this solution only applicable to VB.NET?