title: Correct way to Switch between Dev, Test and Prodcution Services in Builds
body: <p>I have a client side app (WPF) that hits my web services.</p>
  
  <p>When I am running in dev I want to hit the Dev version of these web services.  When I am running in the Test environment I want to hit the test version of the services.  Like wise for production.</p>
  
  <p>Since these values are in my app.config file what is the best way to switch between them?</p>