HiI have a doubt about intefraces and their place in real world applications.i wrote one web app (3 layers):BO : business objects and collectionsDAL : access to sql server and returning either objects or lists.DLL: access to DAL and doing some business rules.PL: presentation layer access to BLL and format outputsnow i did not use interfaces in whole application but i want to know if this design is right or i should add interfaces and if it is the case where and how Thanks ...
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