What GUIDs are you talking about? If you refer to COM registration, .NET can
register for COM Interop the public classes of your assembly using
regasm.exe or similar.
If you want a public class not to be COM-registered, you can use the add the
COMVisible(False) attribute to the class.

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Best regards,
Carlos J. Quintero
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> If a public class which not create a GUID by itself, Visual studio will
> generate one and install it into system registry, is it right?
>
> Actrually, I had a project with some public class defined. but I don't
> want system registry aware of them.