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="16460C0DB4709955FE127D4F6C325C96B64C4F8E7B5FB8B96A281EE75E4173C7E4651D3A9DB0A206C2463464677257D8AC9C7D38F90E344E63CAC4D5F24B2E3E" decryptionKey="603F6C87D63D468F85D60CFD5455448408A3238320C3B1FDAF5708C8878CBC64" validation="SHA1" decryption="AES" />
.net1.1
<machineKey validationKey="24E7F4D605FA45611B13C9CDD228CC1341CE8E27FECA4EDE0647A5509B4CAE57A220A0A8E2C0BBF45761C694AE1494104EC787C652A387E5C11C690137AF032D" decryptionKey="FE9B2515D1FEA0E10F56AC318DCB498A78C46655C994FC6F" validation="SHA1" />

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