Put the below code at the end of the aspx page

<script language="javascript" type="text/javascript">
var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_endRequest(OnEndRequest);
function OnEndRequest(sender,args)
{
window.location.hash = '#MOVEHERE'; //MOVEHERE is the anchor name
}
</script>

If you want to show top of the page instead of move to anchor use window.scrollTo(0,0); instead of window.location.hash = '#MOVEHERE';

If you are looking  for how to move to anchor in a usual postback check this http://forums.asp.net/t/1311972.aspx

And if you wanted to make the transition a bit slicker you could throw in some JQuery code, microsofts new bestest buddy in the javascript world.

A plugin like the one linked below would animate a smooth scroll down to the anchor rather than a standard jump.

• http://flesler.blogspot.com/2007/10/jquerylocalscroll-10.html

Thank you fort the tip..

Yeah JQuery + Asp.Net AJAX is simply great... http://encosia.com/ has some really great articles on that subject

 thank you very much...