title: Visual Studio: differentiate app.config for debug and release mode
body: <p>Is there a way to automatically use a separate app.config when building in release mode?</p>
  
  <p>In other words, I want to test with one app.config, and release with another.</p>
  
  <p>Currently, I keep a separate copy called app.config.production, and manually overwrite bin\Release\Application.exe.config after building for release.</p>