title: What is App_Browser Folder and why it caused to Bug?
body: <p>I have a website in which I used <a href="http://www.asp.net/cssadapters/" rel="nofollow">CSSFriendly</a>. <a href="http://www.asp.net/cssadapters/" rel="nofollow">CSSFriendly</a> convert Asp.net Menu to UL-LI items.</p>
  
  <p>When I Add <a href="http://www.asp.net/cssadapters/" rel="nofollow">CssFriendly</a> Project to my solution and build it, it add</p>
  
  <ul>
  <li>1 App_Browser folder to my Website</li>
  <li>1 DLL (with pdb) in BIN</li>
  <li>1 __browserCapabilitiesCompiler.compiled in BIN</li>
  </ul>
  
  <p>files</p>
  
  <p>I'm wondered that everything is OK in my IIS. but when I upload it to my host it caused to a bug. when I removed <code>__browserCapabilitiesCompiler.compiled</code> from <code>bin</code> and also delete <code>App_Browser</code> from the root, problem resolves and website displayed. But unfortunately <a href="http://www.asp.net/cssadapters/" rel="nofollow">CSSFriendly</a> don't work at all.</p>
  
  <p>So what's the matter and how can I resolve the issue.</p>