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="77F24A7AA299FBBBD3126EDA652132855089E1A4B2447058887126CB262FFF48A1DCE0E1F7813F2A0AEECC5DF8490DA6D558F33D6A7E233B8DF89B4DEF8CD904" decryptionKey="3B13B59AF0AD02ACF4A3244F1AA809E1CE4AC157244EFBC83EB378D654556C3E" validation="SHA1" decryption="AES" />
.net1.1
<machineKey validationKey="81E4CA988C3D9B0436DFE877AB2D346841DD9CD9B7D31FABF827F7E5EC070B75107EB50DEFB5857D4A16A469E315B08E6527E18900D80AF2ADBE71090503C17C" decryptionKey="6F7E2D0B6A9485335C49961DE036391981CF37ADA38A51BA" validation="SHA1" />

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