ASP.NET 3-tier tutorial in C#, in this tutorial you will learn how to implement 3-tier architecture in asp.net using c#. 3-Tier architecture is also called layered architecture. Some people called it n-tier architecture. Layer architectures are essentially objects and work in object oriented environment just like asp.net. 3-tier architecture is a very well known architecture in the world of software development, it doesn't matter whether you are developing web based application or desktop based, I believe it is the best architecture to use.