title: Change the doctype of an aspx page dynamically
body: <p>We use master pages in our web application, the doctype is defined in the master page.</p>
  
  <p>On one of the pages I need to change the doctype, or else a third-party control renders incorrectly.</p>
  
  <p>How can I change the doctype of only that certain page without affecting the rest of the pages?</p>