The wsdl.exe tool generates an interface class xxx.vb

I placed the generated xxx.vb into my virtual web directory along with the
corresponding xxx.asmx file.  I have searched the VB.NET docs, and do not
see how to include the interface into my asmx.  I suspect Imports statement
might do the job, but cannot manage to get it correct.

Can someone point me to docs that explain how to write the ASMX file that
includes an interface?

Thanks,
Michael Giroux