Poll Error

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4/22/2010 4:59:41 AM
David Allen
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Poll Error

Hello,

I have created a new page that contains a poll and it seems to be working for some people and not others for no apparent reason.  Looking in the SystemLog I find entries like this when users are unable to select a poll option.  They can get to the poll web page but receive the server error has occured error when trying to select an option.

2010-04-22 10:45:19,934 ERROR mojoPortal.Web.Global - 213.86.4.252-en-US - /poll.aspx
System.Web.UI.ViewStateException: Invalid viewstate.
Client IP: 213.86.4.252
Port: 3072
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-us) AppleWebKit/531.22.7 (KHTML, like Gecko) Version/4.0.5 Safari/531.22.7
ViewState: 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... ---> System.Web.HttpException: Unable to validate data.
at System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, IVType ivType, Boolean useValidationSymAlgo)
at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString)
--- End of inner exception stack trace ---

 

Any thoughts anyone?

Thanks.

4/22/2010 6:59:25 AM
Joe Audette
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Re: Poll Error

Hi,

ViewState errors can happen when users are on a slow connection and they click buttons that do postback before the page is fully loaded. They can also happen from bots that manipulate the markup before postback.

It is basically ASP.NET security which is trying to validate that the view state posted is the same viewstate that was served in the first request of the page.

Hope it helps,

Joe

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