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How to release db file updates without the client loosing its records?

4
I'm struggling to find a solution with the release of updates of a windows application. When I modify the SQL database (integrated mdf file) adding maybe new tables or stores and I publish the new version of the app, the client correctly updates the program but looses all its records (the database seems to be totally replaced).
I'm wondering if anyone knows how to avoid the client loosing its records, but at the same time get the database being updated with the new features.

Thanks in advance guys!
Nov 23 '10 #1
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