According to this guy http://ryanfarley.com/blog/archive/2004/07/13/879.aspx it's not a good idea to write to App.Config:

Warning: As a rule of thumb, it is not good to write back to the config file. The framework does not include this ability for a reason. If you want your application's users to not require administrative rights then it is always a better idea to store settings in the user's documents & settings directory or in the registry if needed. That said, this won't break anything and does come in handy for utility applications etc.


1. Why not? Isn't the point of App.config to save app settings?
2. If not, then where's the best place to save user settings?

Thanks