title: Asp.net Initial data in pull in UpdatePanel
body: <p>I have a dropdown list which gets populated from an odata service in Page_Load.
  The dropdown list resides in an UpdatePanel control.</p>
  
  <p>Currently the page does not load until the dropdown list is populated. </p>
  
  <p>How can I make it so that the page loads initially and then keeps populating the dropdown list in the background?</p>