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="E4B7464D81F0BCA8D4DAC57313FA7FADAAFFFDC0318B3C8BB51025C0CC27C49B254F7B95B9EF5D93A919390421B2605807E667DDC9A3BC918883CF1D94016833" decryptionKey="55394F69309F95780F02A80519A8A8CBBC107840CF42706112B2E74678C9E17E" validation="SHA1" decryption="AES" />
.net1.1
<machineKey validationKey="326B3A0AEB7C65069F83CA837908248144ECCFE6D5DFA3EAFD57B9523F6A8D26982E00A018B4E665CD018E6DC876BF4ED79003F41B4DF34BFF89D41B86C8A49F" decryptionKey="8BF3FE8BA35EC32CF2836C5D8B47E59C9F6EA855D64035E4" validation="SHA1" />

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