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="D070935DEE80E220761F896624E7479DC9A5F80288C3911F3EFBF98560575D9FC85BDF96126D729874D64CC2740E200AAEA693156B7912D3C072B6AB7441ED9A" decryptionKey="515DB595C35EAD74959418E750BC9D4C9CB44EACDEAC9915A698B53364C985A2" validation="SHA1" decryption="AES" />
.net1.1
<machineKey validationKey="78475F2D9F48F716CE2F3DAF4EB6C7847AACD7FD4F5DD1C7581133F04D8372EFE9220448F0867F0FF96365EEEAC47CC2CA54E923911A7F34A3C3F2A5CBBB0396" decryptionKey="CB0B444C1A0F58DB0DDDEAA53AB14E41E19D77E02BC9E403" validation="SHA1" />

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