Error : "Validation of ViewState Mac failed" with ASP.NET 2.0

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.

To fix it, add the below given code into your web.config or
the file that you are executing and see if your issue gets fixed.

"

"