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can you please describe what an n-tier architecture is. what is a data access layer? what type of code would typically go into this data access layer class? i have basically the same question for the business access layer. what type of code typically goes there? finally, can you also explain, in high level, how these layers interact with each other? thanks.
http://en.wikipedia.org/wiki/N-tierMicrosoft Patterns & Practices site is a good resource for this type of stuff. They’ve published a book ($$$ for print, free-as-in-beer ebook), the Microsoft Application Architecture Guide v2, which has a solid overview and walkthrough of N-Tier:
Application Architecture Guide: Design Fundamentals