C# - Aspx Submit Form Error?

Dec 14, 2010

Im working with asp.net framework 4.0 and I have this code:

form id="form1" runat="server" method="get" action="Profile.aspx"

// some code


asp:Button runat="server" ID="SubmitButton" Text="Submit"

Each time i click the submit button i get this error: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.

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