I\'m working on the upgrade feature for my WiX-based installer.
As part of the instalation, we are installing a web.config file and then using a custom action to upd
Don't use a custom action to update your config file is the other obvious idea. Instead get WIX to do the update via the XML extensions. E.g.
This is using a [SQLSERVERANDINSTANCE] variable which needs to be setup before hand.