ajax call on window.onbeforeunload

[Kash]

I want to save records if use navigates to other pages I am using general ajax request onbeforeunload.
but it gives me following error

1. Uncaught Sys.WebForms.PageRequestManagerServerErrorException: Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 0

Sys.WebForms.PageRequestManager._endPostBack
Sys.WebForms.PageRequestManager._onFormSubmitCompleted
(anonymous function)
(anonymous function)
Sys.Net.WebRequest.completed
_onReadyStateChange
Telerik.Web.UI.WeResource.axd:15

I am using following script

<script language="JavaScript1.2" type="text/javascript">
window.onbeforeunload = function() { $find("<%= RadAjaxManager1.ClientID %>").ajaxRequest(''); }
</script>

ASPX Code:
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" 
        onajaxrequest="RadAjaxManager1_AjaxRequest">
        <AjaxSettings>
            <telerik:AjaxSetting AjaxControlID="divInterviewEvents">
                <UpdatedControls>
                    <telerik:AjaxUpdatedControl ControlID="divInterviewEvents" LoadingPanelID="RadAjaxLoadingPanel1" />
                </UpdatedControls>
            </telerik:AjaxSetting>
        </AjaxSettings>
    </telerik:RadAjaxManager>

Code Behind:
protected void RadAjaxManager1_AjaxRequest(object sender, AjaxRequestEventArgs e)
        {
            this.SaveRecord();
        }

[Maria Ilieva]

Hi Muhammad,

I tried to replicate the described issue locally but to no avail. Please find attached a sample runnable application which works correctly on my side. test it locally and verify what the difference in your case is. Also please test your application by using regular asp UpdatePanel and verify if the issue still persists.

Regards,
Maria Ilieva
the Telerik team