If you have some old classes/methods that you can’t get rid off, but you dont’ want anyone to use them for new development, you should mark them as deprecated, which can be done with the Obsolete tag:
<Obsolete("Don't use this class")> _
Public Class Whatever
End Class
This will cause any reference to Whatever to produce a warning. You can treat these as errors if you want by using one of the other constructors like this:
<Obsolete("Don't use this class", True) > _
Public Class Whatever
End Class
Chris May 