I have found Solution myself
<script type="text/javascript">
var xPos, yPos;
var prm = Sys.WebForms.PageRequestManager.getInstance();
function BeginRequestHandler(sender, args) {
if ($get('<%=Div1.ClientID%>') != null) {
xPos = $get('<%=Div1.ClientID%>').scrollLeft;
yPos = $get('<%=Div1.ClientID%>').scrollTop;
}
}
function EndRequestHandler(sender, args) {
if ($get('<%=Div1.ClientID%>') != null) {
xPos = $get('<%=Div1.ClientID%>').scrollLeft = xPos;
yPos = $get('<%=Div1.ClientID%>').scrollTop = yPos;
}
}
prm.add_beginRequest(BeginRequestHandler);
prm.add_endRequest(EndRequestHandler);
</script>