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You can find a lot of debugging and deploying problems while developing applications in .NET and Visual Basic here. There are also some querying tips in SQL and typical source codes which might be useful shared here.

Validation of viewstate MAC failed

Error : Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machinekey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.

Solution : Add this part to the web.config System.Web section:
<pages enableEventValidation="false" viewStateEncryptionMode ="Never" enableViewStateMac="false" />
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  1. chai said...

    nice post

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