can any body tell me about how can create the 3 tier model aplication.how can we create the layers in asp.net?

thanks in advance

All it is is separate files. Your design layer (just design and html with the reference to the coded file), your coded file (the code that is relative to the specific page with reference to a common file), and your common file (the code that is common among most other pages/functions/subs/classes).

It keeps everything separate so a designer doesn't F'UP your programming, and creates an easy place to make changes that effect the entire site/application.

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