How to solve ASP.NET Validation of viewstate MAC failed

STEP 1: Generate a key from KEY GENERATOR

STEP 2: Place the keys in your section of web.config as below

<system.web>
...
<machineKey
validationKey="56AB7132992003EE87F74AE4D9675D65EED8018D3528C0B8874905B51940DEAF6B85F1D922D19AB8F69781B2326A2F978A064708822FD8C54ED74CADF8592E17"
decryptionKey="A69D80B92A16DFE1698DFE86D4CED630FA56D7C1661C8D05744449889B88E8DC"
validation="SHA1" decryption="AES" />
...
</system.web>

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