Setting
EnableViewStateMac=true is a security measure that allows ASP.NET to ensure
that the viewstate for a page has not been tampered with. If on Postback, the
ASP.NET framework detects that there has been a change in the value of
viewstate that was sent to the browser, it raises an error - Validation of
viewstate MAC failed.
Use <%@ Page
EnableViewStateMac="true"%> to set it to true (the default value,
if this attribute is not specified is also true) in an aspx page.
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