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===Persistence state maintenance===
CSLA defines a standard way of allowing a business object to maintain information about its "persistence state". In other words, an object knows when it is new (it represents data that hasn't been saved yet) and when it is dirty (it needs to be saved to the database either because it is new or because its member data has been changed since it was last loaded). Business objects can also be marked for deletion so they can later be deleted (for example when a user has pressed a button confirming his or her intention to delete the rows.)
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===N-Level undo===
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