Sometimes, Visual Studio and Entity Framework caches Appsettings and becomes nearly impossible to diagnose     Things to Try:      - Restart the computer      - Clean Solution      - Rebuild Nothing happens. Solution: Press Windows Key + R then type in %temp%,  a folder pops up, close Visual Studio if it is running                  - Delete all files in that folder except for files that can't be deleted.                   - Restart your Computer and Visual Studio