title: 'System.Configuration.ConfigurationSettings.AppSettings' is obsolete
body: <p>I got the following warning</p>
  
  <blockquote>
    <p>'System.Configuration.ConfigurationSettings.AppSettings' is obsolete:
    '"This method is obsolete, it has been replaced by
    System.Configuration!System.Configuration.ConfigurationManager.AppSettings"'</p>
  </blockquote>
  
  <p>How do you fix it?</p>