Typed datasets in the business layer

5 Oct 2006 1:55 PM

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.

5 Oct 2006 2:41 PM

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/?_c11_blogpart_blogpart=blogview&_c=blogpart&partqs=amonth%3d5%26ayear%3d2006
(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.

<pablo***@gmail.com> wrote in message
Show quote

news:1160056511.729279.195970@e3g2000cwe.googlegroups.com...
> 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.
>

7 Oct 2006 12:19 AM

Arne_Vajhøj

pablo***@gmail.com wrote:

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

It should not.

Arne