Convert a console application to a web service (sort of)

Gentlemen,  It is a year after your posts but I have a similar question.  I have built a console application with its own Main and now wish to convert it to a DLL for consumption by a web service.  I have already built and tested the web service but for the life of me, I can not remember how to remove the ".exe", the small tester Main code.  The vs2008 C# compiler throws a "mising main function..." error.

Any advice for me gentlemen?