Question : how do I catch a server status code 503 on a .NET page utilizing AJAX timers ?

I have an ASP.NET page that utilizes AJAX to do postbacks every 90 seconds.
However, periodically the server returns a 503 status code and then this annoying pop-up appears saying..."System.WebForms.PageRequestManagerServerErrrorException........The status code returned from the server is 503"

Is there a way to catch this error either on the client or sever? Ideally, Id like to ignore it.
NOTE: I AM NOT USING THE HTTPREQUEST OBJECT TO DO THE POSTBACKS. THE TIMER AND UPDATEPANEL ARE DOING THEM AUTOMATICALLY

Do I attach an event to the Script Manager_AsyncPostBackError event ?? If so, how do i check & see if code 503 was returned ? Or is there another solution ?

thanks in advance for all your help

Answer : how do I catch a server status code 503 on a .NET page utilizing AJAX timers ?

here is a good example to start using ajax error handling
http://asp.net/ajax/Documentation/live/tutorials/CustomizingErrorHandlingforUpdatePanel.aspx
as for checking the status, I think you can use the error property of the args parameter to check the status
if(error.httpStatusCode==503)
{
//Do something
}
look at the posted link first