In the code behind I have a MessageBox class that I use to pop up message boxes. I have a form that when submitted produces an Ajax asynchronous post back. At this point the UpdateProgress timer pops up. If I now programmatically call a message box I get the following error...
"Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.
Details: Error parsing near 'owsummary']|"False"|<script language='ja'."
Any ideas how to get around this?