3 tier architecture using Microsoft Enterprise Library

I've heard some companies have a well structured 3-Tier architecture ASP.NET projects. I do some research on the Google, and find that some people use Microsoft Enterprise Library to build a architecture. They have BAL, DAL, DLL folder under project (not in App_code folder) and then have so many helper classes.
Do you have any samples?
bbkevinAsked:
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gopalchettriCommented:
Please check the link below, its simple concise and too the point with demo codes

http://radicaldevelopment.net/2011/02/21/n-tier-architecture-example/


revert me back for further help !
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gopalchettriCommented:
the link below contain hands on labs for Enterprise Library for Architecture
http://entlib.codeplex.com/
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