Single Tier—Single Layer Model

We will have a single project in our solution, which will have UI, BL and DAL code under a single namespace.

ASP.NET Web Project compiling into a DLL in the /bin folder and under a single namespace: MyApp

No. of project files: 1

No of namespaces: 1

There is no separation of presentation, business logic, and data access code layers. Because we will have only one assembly (or set of assemblies) that cannot be distributed independently, this model would be single tier and single layer. We can use this model for very simple projects, on which only one developer is working and where we are sure there are no major scalability or maintainability issues. For example, a personal guestbook system, small 2 or 3 page web applications, or web sites with mostly static content.