>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