Typed datasets in the business layer

[pabloch2]

Why the data access layer should use untyped datasets? and Why the
business layer should use strongly typed datasets?
Is this applicable to the 3 layered architecture in general or is it
related with the implementation in .net?

Can someone recommend me a good book to learn in depth the 3 layered
architecture?

Thanks.

 

[sloan]

If you check out 2 things:


http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnbda/html/BOAGag.asp
Read the entire thing(long) but especially the section labeled:
"Deploying Business Entities"

and

http://sholliday.spaces.live.com/?_...ogview&_c=blogpart&partqs=amonth=5&ayear=2006
(May 2006)


The data access layer can return typed datasets to the business logic layer.
The MS article above suggests putting those (strong) datasets in its own
assembly, which all other tiers can use.

 

[=?ISO-8859-1?Q?Arne_Vajh=F8j?=]

Why the data access layer should use untyped datasets? and Why the
business layer should use strongly typed datasets?

It should not.

Arne