title: Change app_themes dynamically
body: <p>I want to give my admin user the ability to change the app_themes value in the web.config dynamically, using a asp:dropbox. I have seen websites and samples in the web that allows the user to change the theme at run-time. These samples doesn't update the web.config theme value and I want my admin (office boss) to be in control of this.</p>
  
  <p>Is there a way to:</p>
  
  <ol>
  <li>Get all folder names to display them in a dropbox?</li>
  <li>Update the web.config app_themes value with the selected value in the dropbox?</li>
  </ol>