title: Multiple values for a single config key
body: <p>I'm trying to use <code>ConfigurationManager.AppSettings.GetValues()</code> to retrieve multiple configuration values for a single key, but I'm always receiving an array of only the last value. My <code>appsettings.config</code> looks like</p>
  
  <pre><code>&lt;add key="mykey" value="A"/&gt;
  &lt;add key="mykey" value="B"/&gt;
  &lt;add key="mykey" value="C"/&gt;
  </code></pre>
  
  <p>and I'm trying to access with</p>
  
  <pre><code>ConfigurationManager.AppSettings.GetValues("mykey");
  </code></pre>
  
  <p>but I'm only getting <code>{ "C" }</code>.</p>
  
  <p>Any ideas on how to solve this?</p>