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For the ease of understanding, I have created BAL, DAL into the App_Code folder.
In real scenario, you should create separate projects for BAL, DAL (as Class Library) and UI (as Web project) and reference your BAL into UI.
3-Tier architecture is a very well know buzz word in the world of software development whether it web based or desktop based.
In this article I am going to show how to design a web application based on 3-tier architecture.
Download source code for 3-Tier Architecture in ASP.