At the end of the day, the sales person will connect to the network and update changes for overnight processing.Another scenario is making a Web site more scalable.With a Sql Data Reader, you have to go back to the database for records every time you show a page.This requires a new connection for each page load, which will hurt scalability as the number of users increase.
These are the mechanics of working with disconnected data.
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Consider sales people who need customer data as they travel.