found this article:
Re: The type '<class>' exists in both '<dll location>' and '<dll
location 2>'
With Web Applcation Project you want to make sure that you don't use a
app_code directory, since classes within that directory will indeed get
compiled twice (once in the code-behind and once at runtime) unless you
explictly exclude the file from WAP project. Try renaming the app_code
directory to something else to fix it.
BTW - this tutorial walksthrough how to migrate an existing VS 2005 Web
Site Project to a VS 2005 Web Application Project:
http://webproject.scottgu.com/CSharp...igration2.aspx
Big help!