Document Expired Issue

Surrounded with an UpdatePanel to resolve this issue.  This prevents the "Document Expired" issue if you press the browser back button in the detail. The reason is that when you click the back button the browser is  re-POSTing the same information, and the browser warns you about that. Normally the browser request is the POST/GET, however with the UpdatePanel it uses the XMLHttpRequestObject, which prevents the full page refresh, and does not use the browser POST/GET.   Thus side-stepping the issue.

http://stackoverflow.com/questions/11639186/asp-net-webpage-expired-cache-issue
http://aspalliance.com/1315_AJAXenable_an_Existing_ASPNET_Web_Page.3
http://stackoverflow.com/questions/21477464/post-back-and-browser-back-button-issue-in-asp-net

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