If you have ensured that the upgrade process was correctly performed and the development copy of your project is running flawlessly, I would suggest you to copy and replace the contents of the bin folder of your 4.4 project with the contents of a bin folder of a brand new 5.0 project. By copying the 5.0 dlls over the 4.4 dlls, the upgrade scripts will be executed which eventually will upgrade your configuration files and the database.
Please note that you need to restart the application ( by making a dummy change to the web.config ) after you replace the dlls.
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