Solution For ajax async postback end does not work
<script type="text/javascript">
function pageLoad(sender, args) {
//$(document).ready(function () {
Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(beginReq);
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(endReq);
Sys.Browser.WebKit = {}; //Safari 3 is considered WebKit
if (navigator.userAgent.indexOf('WebKit/') > -1) {
Sys.Browser.agent = Sys.Browser.WebKit;
Sys.Browser.version = parseFloat(navigator.userAgent.match(/WebKit\/(\d+(\.\d+)?)/)[1]);
Sys.Browser.name = 'WebKit';
}
var xPos, yPos;
function beginReq(sender, args) {
// $find(ModalPopup).show();
}
function endReq(sender, args) {
// $find(ModalPopup).hide();
}
//});
}
</script>
Use this script inside the page. :)