Hi Peter,

As Bruce has suggested, one way to prevent this behavior is disable client
output cache in your page , thus whenever you click back button at client
browwer after a postback, it should display the expired page screen.

Also, another means you can consider is manually use Response.Redirect to
relocate the page to the current location. e.g.

============
#postback handler
{
//after finishing work

Response.Redirect(the page want to display);
}
=============

Also, this can help prevent resubmit the page when user click refresh
button.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead



==================================================

Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
ications.



Note: The MSDN Managed Newsgroup support offering is for non-urgent issues
where an initial response from the community or a Microsoft Support
Engineer within 1 business day is acceptable. Please note that each follow
up response may take approximately 2 business days as the support
professional working with you may need further investigation to reach the
most efficient resolution. The offering is not appropriate for situations
that require urgent, real-time or phone-based interactions or complex
project analysis and dump analysis issues. Issues of this nature are best
handled working with a dedicated Microsoft Support Engineer by contacting
Microsoft Customer Support Services (CSS) at
http://msdn.microsoft.com/subscriptions/support/default.aspx.

==================================================
   

This posting is provided "AS IS" with no warranties, and confers no rights.