Cached partial page - Data is invalid!

Cached partial page - Data is invalid!

I have a simple mobile app built to view/edit/close orders, so the data displayed to the user must be freshly received from database on every page/partial_page request.
 
The problem is that after a partial page is received the first time (from the server), it is always cached from that point forward unless I clear cache in my browser (testing with IE9). 
 
This is my actionlink to call the page in question.
<li > @Html.ActionLink( "Open Orders (" & ViewBag.MyOpenOrderCount.ToString & ")" , "OpenOrders" , "Main" , Nothing ) </ li >
 
 
The contents of the data in the OpenOrders page is within this...
<ul data-role ="listview" data-inset ="true">
      < li data-role ="list-divider"> Open Orders </ li >
                   @For each .....
 
Thanks,
Chris