Sys.WebForms.PageRequestManagerParserErrorException - what it is and how to avoid it

Sys.WebForms.PageRequestManagerParserErrorException - what it is and how to avoid it

If you've used the Microsoft ASP.NET AJAX UpdatePanel control, there's a good chance you've hit the "Sys.WebForms.PageRequestManagerParserErrorException" error.

http://weblogs.asp.net/leftslipper/archive/2007/02/26/sys-webforms-pagerequestmanagerparsererrorexception-what-it-is-and-how-to-avoid-it.aspx