Generate Machine Key:

If you sick of getting this error:

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

Maybe it is time to specify a machine key... just paste this into your web.config file inside the <system.web> tag.

.net2.0
<machineKey validationKey="DA70D1CB6A849AE1DA365D1443EB9A8310A887764412315EE678CBB036D802FFFC7ECD0888BC9F6EE0571F684281DEBA15ACC44941A7415A7746D23944CF1DCC" decryptionKey="4C5254F0B51F76352834CF36B8B27F862DE535F533CD1590DF45760610E89482" validation="SHA1" decryption="AES" />
.net1.1
<machineKey validationKey="F3F939E0F178EF69EF8C4E2E5FF0FF3108ABE3099D83C7E1DA9D2A323040220D92862457BFE5A27AB2A04AD5FBFD814B03F0E8C45CD0BDF4DC2E07834FF39B23" decryptionKey="237435796C943998748F677FA54504A4ADEFA217F244F939" validation="SHA1" />

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