I am creating setup of my project using Visula Studio 2008. I am facing problem in setup installation.

If I uninstall old setup (application) and install the new one then config file (App.config) updates the attributes (surely it is new file) of config file but if I install new setup without uninstalling the old one then config file does not update.

from config file I mean MyProject.exe.config

Why is this behavior of config file. Should it not be updated on installation of the new setup

Is this possible to delete and copy the config file of new setup?

Is there a way to update only config file forcefully during installation.

Thanks for your help!