>>Hello i want to ask
>>1 · 3 tier applicatrions is only for web applications or it can be for desktop applications and LAN too?
>>2. anybody knwo where can i find sample applicatiosn with ntier applications in visual basic .net
>>
>>Luis Martin
>
>1) 3 or N-tier is not tied to web programming. You can use it for desktop applications too and I think that is one of the reasons N-tier development is preferred over single tier. A common N-tier approach is 5-Tier (where it could be seen as 3-tier combining parts of it):
>Presentation, UI, Business, Data Access, Data Storage. You may think of Presantatio+UI as a single tier (or layer). That layer is the one that changes between a web application or windows/mobile device application.
>
>2) There are tons of samples on the internet. You may for example check:
>http://msdn.microsoft.com/en-us/library/ms973279.aspx
>http://www.microsoft.com/downloads/details.aspx?FamilyID=6EB67F59-D075-4B28-B3C4-E9294FF3CF4A&displaylang=en
>
>Almost all applications you build using .Net and Visual Studio are N-Tier (if you do not explicitly try to make it single tier).
>Cetin

We use the 5 - layer approach (actually ours has a couple more layers) and MVP pattern for our desktop and web apps.

Luis, if you are interested, there are some good podcasts with examples on the MVP pattern here:

http://polymorphicpodcast.com/shows/mv-patterns/

As someone pointed out in another thread, there are more design patterns to choose from including the MVC, MVP, and now the MVPC pattern :) Lots more to read up on. Lots of information on the web about it all.