Seperate business and datalayer in c#

I am going to make a larger project, and would like to know if any of you experts know some good resources to read about how to seperate the Data Layer from the Business Layers in c#?
Thanks in advance
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Use SubSonic, it automatically creates and updates your DataLayer (DAL), its free,  takes only a few hours to learn with their easy to follow training vidoes, and you don't have to spend alot of time learning/creating/updating DAL's.  Then you can concentrate on creating a Business layer (BL) which is just a set of methods to implement business needs like so:

public bool AddToShoppingCart(string item)
                //Logic from DAL (built by SubSonic)
                ShoppingCartController cntrlrShoppingCart= new ShoppingCartController();
                return true;
DofsAuthor Commented:
I am going to use NHibernate to connect to my database to make it ORM. I have read where they talk a little about how to distinguise data and business layer so you don't merge them by time. But I would like to read a little more on how to do it?
Isn't SubSonic just another way to do ORM as NHIbernate does?
DofsAuthor Commented:
I am closing this thread.
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