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Will 说:

Nice code.

Well, I have 2 comments.

1) You can remove the forward function calls in UserInfo, so as to make UserInfo decoupled from the o/r mapping utilites, for more compact code and less coupling

2) It is better to let UserUtilities to return a collection of UserInfo (e..g IList<UserInfo>) other than DataSet, so that the client code is less coupled with ADO.NET techonology

Will 说:The pattern you used in UserInfo is called "Active Domain Object". In my personal opinion, I prefer not to use this pattern and keep the domain objects pureCasper Liu 说:o, thanks very much... I will think about your suggestion and have a discuss  Will 说:The philisophy is that Domain Objects should only have the knownledge on how to manage its internal state information, but not to have the knownledge on how to persist itself - this kind of knowledge tends to change with time, and should be owned by some "professinoal" externals else(O/R mapper and its related configuration info, for example)  

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