title: How to determine appconfig contains a specific key
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/3295293/c-sharp-assembly-app-settings-how-to-check-if-one-exists">C# assembly &gt; app settings &gt; how to check if one exists?</a>  </p>
  </blockquote>
  
  
  
  <p>In the app.config, How can I know if it contains a specific key?</p>