Comments by thoiness (Top 5 by date)

Or... Maybe the assumptions I am making that this is a code issue are wrong.

In IIS, is this site in the root of the web, or is it in a sub-directory of a root web? If it's in a sub-directory, have you double checked to ensure that the sub-directory has been converted into an application? I ask, because obviously, if it's in a sub-directory, and not an application, it would be searching the root /bin directory for your dlls.

Ah... One more thing I can think of. Was this a dll that was included externally? If so, did you include it in the references section of your application by browsing to the dll and adding it?

That's definitely the last idea I have.

There should be an Entities.somealphanumeric.dll (depending on how you are compiling) that contains that class. If the using was at the top of the page and the app was compiled before moving the bin directory, then I'd be out of ideas at this point.

Is this JavaScript or ASP.NET JScript you are trying to perform here? I suspect it is the previous, but you'd need a lot more code displayed here for people to understand what you're attempting to do (e.g. Where is the code that defines what calculator is?).