Difference betwen single tier and N tier application.

[rahul net11]

Hi to all, I have one query. Can anybody tell me what is N tier architecture. I know little bit difference between single tier, two tier architecture Can anybody tell me what is actual difference between single tier,two tier and n tier architecture. If i am developing a site how can i know its a single or multi tier architecture. Thanks. Rahul

People Laugh on me Because i am Different but i Laugh on them Because they all are same.

[asithangae]

hi, In a simple way, we can say like this... Consider that your website is a database interactive application.so, you web site application will have code for displaying the data in the page and also for retriving the data from the databse. if you did the coding of retrival from DB and displaying it in UI in the code behind page, you are following single tier architecture. suppose if your DB retrival is a separate class or project consists of generic DB interaction class without depending on the Application context then it is two tier architecture. Means you DB layer is separate from UI layer, two components. if you still separate the Business Layer then 3 tier architecture, that is the DB Layer as earlier and separting the UI as entity object being used in UI like for example Class Employee with business logic and Employee object is being used in UI layer(code behind file) then three tier architecture, having DB layer for DB interactions and Business Layer as Employee and third part is code behind file. still we can proceed like this by using COM and web services. these are N tier architectures. Cheers:) asithangae