ParserErrorException when Edit button on Datagrid pressed

I have a datagrid control wrapped in an UpdatePanel. There are Edit/Delete ImageButton's for each row. The first time I press the Edit butonn (setsEditItemIndex = -1) the ubiquitous Sys.Webforms.PageRequestManagerParserErrorException; The message from the server could not be parsed...

Subsequently, pressing the edit button prooduces the desired results.

Any ideas with this strange behavior are appreciated.

TIA

Hi,

Please refer to this:http://siderite.blogspot.com/2007/02/aspnet-ajax-and-responsewrite-or.html

It gives a full explanation of it. Hope this helps.

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I also face this kind of problem - 'Sys.WebForms.PageRequestManagerPerserErrorException:'. So far I
understand this happen when there is some unrecongnize html render or event occurs. I'm also not very clear.

But I solve the issue by set the attribute EnableEventValidation="false" in the ASPX page, where I place my
UpdatePanel.

Thanks
I also face this kind of problem - 'Sys.WebForms.PageRequestManagerPerserErrorException:'. So far I
understand this happen when there is some unrecongnize html render or event occurs. I'm also not very clear.

But I solve the issue by set the attribute EnableEventValidation="false" in the ASPX page, where I place my
UpdatePanel.

Thanks