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How to know that User is navigating away from one site collection to another

Posted By:      Posted Date: December 04, 2010    Points: 0   Category :SharePoint


I have a requirement  in which when user clicks on a check-box the it should remember all the values present in that page.It should remember this value till the user is on the same site collection but once it goes to another site collection the stored details should get deleted.How do I know that the user is navigating away from one site collection to another and delete the object

Another Q is what would be the best way to store values .Should I use cache/session or anything else?

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