(function () {
    var prm = Sys.WebForms.PageRequestManager.getInstance();

    if (prm) {
        prm.add_endRequest(
                function (sender, args) {
                    // Any code you want here 

                    if (args.get_error() && args.get_error().name === 'Sys.WebForms.PageRequestManagerServerErrorException') {
                        args.set_errorHandled(args._error.httpStatusCode == 0);
                    }
                });
    }
})();