![[ERR!]](https://www.gravatar.com/avatar/a050d5200d7174ddd33df1e447c0d821?d=identicon&s=40)
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This article explains the reason for this error and how to resolve it using the RenderAllHiddenFieldsAtTopOfForm property
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Resolving the error “Validation of viewstate MAC failed” in an ASP.NET