title: MVC 3 WebConfigurationManager.AppSettings["key"] returns null
body: <p>May be it's a stupid  but seems mvc has a bug with web.configs.</p>
  
  <p>I put in Web.config (also I've tried to put keys in web.debug.config) several appsettings keys
  But </p>
  
  <pre><code>ConfigurationManager.AppSettings["key"]; 
  </code></pre>
  
  <p>as well </p>
  
  <pre><code>WebConfigurationManager.AppSettings["key"];
  </code></pre>
  
  <p>returns null. </p>
  
  <p>I looked via debugger in AppSettings.AllKeys - it sees the right keys but returns the null. </p>
  
  <p>What is the problem with AppSettings in mvc?</p>