title: Which file is System.Configuration.ConfigurationManager.AppSettings using?
body: <p>I want to know which *.config file the ConfigurationManager is using.  How can I figure that out?</p>
  
  <p>For instance, you could be changing working directories and execute libraries from various paths.  I'd love to have a way to display something like "Reading AppSettings from c:\MyApp\app.config" in my Trace.</p>