Hi nagaraju60, if i am not wrong, you just want to make the gridview scrollable, right ? Then just put your gridview inside <asp:Panel /> and set the ScrollBars property to Auto.
<asp:Panel ID="Panel" runat="server" Height="500px" ScrollBars="Auto">
<asp:GridView />
</Panel>
And also if you want to maintain Scroll bar position of GV on postback then put below javascript code inside your update panel.
<script type="text/javascript">
var yPos;
var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_beginRequest(BeginRequestHandler);
prm.add_endRequest(EndRequestHandler);
function BeginRequestHandler(sender, args) {
yPos = $("#<%=Panel.ClientID %>").scrollTop();
}
function EndRequestHandler(sender, args) {
$("#<%=Panel.ClientID %>").scrollTop(yPos + 0);
}
</script>
Hope it will help you.