Im trying to add an app.config file to my DLL, but all attempts have failed.
According to MusicGenesis in \'Putting configuration information in a DLL\' this should
ConfigurationManager.AppSettings returns the settings defined for the application, not for the specific DLL, you can access them but it's the application settings that will be returned.
If you're using you dll from another application then the ConnectionString shall be in the app.settings of the application.