Decent code visible example of Entity Framework, POCO and a tiered architecture in the wild?

Can anyone point to a good example of an Entity Framework 4 based tiered architecture using POCOs in C#, preferably written from the aspect of intro开发者_StackOverflow中文版duction to the concept?

What I am looking for is something that shows off using POCOs in a higher tier, passing those back down the tiers to Entity Framework and into the database, with transforms going on as required.

I have seen a lot of articles based around one or the other, but nothing really that puts it all together in a "this is how it all works" example.

Cheers Richard

It isnt the most loved example out there, but it has some good points. The implementation has some weak points, but its improved over time and doc accompying it is worth a read.

http://microsoftnlayerapp.codeplex.com/

The phrase "N-tier architecture" is being downplayed by the "Repository, Unit-of-Work, and Specification pattern" in a lot of articles. Using Repository, Unit-of-Work, and Specification means having an N-tier architecture. You can find lots of articles about this online. Here are some:

http://thedatafarm.com/blog/data-access/agile-entity-framework-4-repository-part-1-model-and-poco-classes/

http://elegantcode.com/2009/12/15/entity-framework-ef4-generic-repository-and-unit-of-work-prototype/

http://huyrua.wordpress.com/2010/07/13/entity-framework-4-poco-repository-and-specification-pattern/

http://www.hightech.ir/Tags/EntityFramework