Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same

I have facing same problem with url rewriting.
but i got solution for this problem.

Added Below code into your master page page load event.

form.Action = request.rawURL

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About Nikunj Satasiya

I am a passionate programmer and a Software Engineer love blogging and developing applications in Microsoft Technologies.

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