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Say you have 3 layers: UI, Business, Data.
Is that a sign of poor design if Business layer needs to access Sessions? Something about it doesn't feel right. Are there any guidelines to follow specifically tailored to web app?
I use c# 2.0 .net
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Business Layer elements are used to model the operational organization of an enterprise in a technology-independent manner, whereas strategy elements (Chapter 7) are used to model the strategic direction and choices of the enterprise.
The data layer manages the physical storage and retrieval of data. The business layer maintains business rules and logic. The presentation layer houses the user interface and related presentation code.
The basic difference is: 1. Business Layer is to define business logic ( data transformation ) and Service Layer is to access data from different client's.
The Business Logic layer handles all of the business rules, calculations and actual logic within your application that makes it actually "do" things and it may often use some of the objects retrieved from your data-access layer.
No. If you had a "Controller" layer, you should access it there. Get what you need from the Session and hand it off to your business layer.
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