title: Multiple AppSettings files, is it possible?
body: <p>I want to create 3 AppSettings config files:</p>
  
  <ul>
  <li>Database.config</li>
  <li>Messages.config</li>
  <li>Global.config</li>
  </ul>
  
  <p>And after add in my App.config:</p>
  
  <pre><code>&lt;appSettings file="Database.config" /&gt;
  &lt;appSettings file="Messages.config" /&gt;
  &lt;appSettings file="Global.config" /&gt;
  </code></pre>
  
  <p>But when I try to access a key that there is in one of three files with the <code>ConfigurationManager</code>, I got the following error: </p>
  
  <blockquote>
    <p>Configuration system failed to initialize. Sections must only appear once per config file.</p>
  </blockquote>
  
  <p>I cannot have more than one AppSettings config file? </p>