If you may get an error just modify the code, remove runnat="server"
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...
<form id="form1" method="post" style="margin-top: 10px; margin-bottom: -23px" runat="server">
action="index.aspx"></form>
action="index.aspx"></form>
Change to
<form id="form1" method="post" style="margin-top: 10px; margin-bottom: -23px">
action="index.aspx"></form>
action="index.aspx"></form>
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