title: Problem mixing webforms into ASP.NET MVC application
body: <p>I've been trying with the idea of taking an existing ASP.NET Webforms application and converting it to a hybrid so that going forward, we can do ASP.NET MVC.</p>
  
  <p>In order to do this, I created an ASP.NET MVC application and started copying some of the folders from the ASP.NET webforms projects that contain webforms.  I'm having a problem building the resulting project getting hundreds of compile errors of this form:</p>
  
  <pre><code>Error   1951    'Documents_Admin_DocPushByTag' does not contain a definition for
  'CtlCategoryList' and no extension method 'CtlCategoryList' accepting a first argument 
  of type 'Documents_Admin_DocPushByTag' could be found (are you missing a using directive
  or an assembly reference?)
  </code></pre>
  
  <p>Each of these error messages refer to server controls in my markup.  It's as if the mark-up is not getting parsed?  When I edit one of the code behind files and type <strong>this.</strong> to see what intellisense recognizes, these controls don't appear.  The event handlers do (but that must be because they are defined in the code behind file).  As far as I can tell, the <strong>CodeFile</strong> and <strong>Inherits</strong> Page attributes are correct (and unchanged from the ASP.NET project from whence they came).  I'm mystified what is causing this problem.  Any ideas?  TIA.</p>