Message in Hebrew (עברית)
'<var>X</var>' root element must implement IProvideCustomContentState, or a Navigating event handler must set NavigatingCancelEventArgs.ContentStateToSave property.
Unlocalized message
'<var>X</var>' root element must implement IProvideCustomContentState, or a Navigating event handler must set NavigatingCancelEventArgs.ContentStateToSave property.
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