When should i go for "spring.net" in asp.net?

When should i go for spring.net framework in asp.net mvc web application? A simple example which could explain its usage in a web application... Any suggestion..

EDIT:

Why spring is used? What is the use of开发者_开发问答 it?

http://www.springframework.net contains lots of different modules, so it might be difficult to answer your question.

But this page gives a nice overview of what's contained in spring.net framework and this page lists some examples/tutorials.

Update: There are really a lot of different reasons why to use spring.net (have a look at the tutorials), e.g: dependency injection, simplifying data access, internationalization support, etc., etc.