Building up a good business library is art. Because every bad decision made early will eat project's time later. Bad decisions will also waste many time of developers who have to use this library in their work. One of the most common mistakes made is mixing DAL functionality to business objects. At first it may seems like a good idea - why not have a smart objects? - but as project goes this solution causes more and more problems. And, be warned, each next problem is worst than previous.
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