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
.net1.1
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