Validation of Viewstate MAC Failed Final Solution

It is so frustrating when you just visit your site and start seeing error that says Validation of viewstate MAC failed.



I once used to face this error and after so much research, I came across the solution below which resolve my solution.

The final solution is below

<system.web>
      <machineKey validation="SHA1" validationKey="A1B2C3D4E5F6F6E5D4C3B2A1A1B2C3D4E5F6F6E5D4C3B2A1A1B2C3D4E5F6F6E5D4C3B2A1A1B2C3D4E5F6F6E5D4C3B2A1A1B2C3D4E5F6F6E5D4C3B2A1B2C3D4E5"  decryption="Auto" decryptionKey="A1B2C3D4E5F6F6E5D4C3B2A1A1B2C3D4E5F6F6E5D4C3B2A1" />
      <compilation debug="false"  />		
      <httpRuntime targetFramework="4.5" />
    </system.web>

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