This sounds like a deployment issue. How are you currently deploying the website? You should use the "Publish" option and publish the site. Also be sure to DELETE all *.dll files in your bin\ directory before publishing. Old versions hanging around will cause problems.
sknake
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Sometimes IIS doesn't recompile assemblies, for some reason it doesn't catch the modification. To solve this restart IIS, or better yet the "World Wide Web Publishing" service.
Start -- Run -- services.msc -- hit
Locate "World Wide Web Publishing", right click, and restart.
See if that resolves your issue.
sknake
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Is the "CommonFunctions" class file included in your web project, or is this a separate assembly and you are calling another DLL? If it is another assembly it is added as a reference in your project?
sknake
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