Faking Web.config transformations in app.Config

The web.config XDT transformations used in Visual Studio’s web projects are great for ensuring you don’t end up releasing say, a release version of your code pointing to the test database (yeah, that one with all the amusing names and phrases in it). Unfortunately this functionality wasn’t extended to the app.config. Luckily though we can add it in with minimal hassle, read on for the knowledge.