I just finished a WebCast for Microsoft the topic was Best Practices for .NET Development (you can see it at Previously Recorded Webcasts) there were several interesting question.

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Q. How do you release as COM object from you .NET generated COM wrapper?
A. Use the Marshal.ReleaseComObject Method.

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Q. Is there any naming conventions or guidelines that Microsoft publish?
A. There are guidelines for component developers (Design Guidelines for Class Library Developers) but no coding conventions or guidelines that I am aware of.

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There were more questions (they took 45 minuets to answer) I have forgotten most and most were about where the could get the slides (which will be available on www.interknowlogy.com) so unless I remember another interesting that is all.