getting a error sometimes when trying to page refresh

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i am getting a error sometimes when trying to page refresh

Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

please tell me what is the reason & what is the solution?

Posted 6-Feb-14 21:47pm

Member 10276220

Updated 7-Feb-14 3:22am

ZurdoDev

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ZurdoDev 7-Feb-14 9:23am

As the error says, "Please review the stack trace for more information about the error and where it originated in the code." The error gives a few suggestions. Since you have not shown any of your code or told us anything we can't tell you. There is more than one possible reason for the error.

idenizeni 7-Feb-14 18:12pm

Is this happening in your development environment or in production? If it's happening in development then I wouldn't worry too much about it IF while you are testing you re-compile your application and then try doing a page post-back from a page that was loaded before the recompile.

ZurdoDev 7-Feb-14 19:55pm

It appears you replied to my comment instead of adding a comment to the question.

idenizeni 7-Feb-14 20:39pm

Crap, I sure did. Thanks.

idenizeni 7-Feb-14 20:40pm

Is this happening in your development environment or in production? If it's happening in development then I wouldn't worry too much about it IF while you are testing you re-compile your application and then try doing a page post-back from a page that was loaded before the recompile.

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joginder-banger · Answer 1 · 2014-02-07T19:52:00

XML

<system.web>
<pages enableViewStateMac="false" />
</system.web>

Also tried the following on the page.

<pages validateRequest="false" enableEventValidation="false" viewStateEncryptionMode ="Never" />

or you can follow this link

http://forums.asp.net/t/1485987.aspx?Validation+of+viewstate+MAC+failed[^]