title: web userControl
body: <p>I have create a new empty web application in c# Asp.net 4.0 and then added <code>App_Code</code> folder then added 3 classes into that folder. I have added a web user control and set the reference of <code>App_Code</code> class into the control but it throws an error.</p>
  
  <blockquote>
    <p>The type or namespace name 'App_Code' does not exist in the namespace  (are you missing an assembly reference?)</p>
  </blockquote>
  
  <p><img src="https://i.stack.imgur.com/LesJm.png" alt="preview"></p>
  
  <p>Any ideas?</p>