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Which layer to use for strongly typed datasets in n-tier design?

Which layer to use for strongly typed datasets in n-tier design?

(OP)
Dear All,
I'm designing a new vb.net solution and want to return strongly typed dataset objects from the Data Access to the Presentation layer.  However, I can't decide where to create the datasets within a classic 3 tier design.  As I understand it, the only way that I can use the dataset object in all 3 tiers (Pres, BLL, DAL) is to have a 4th project that is made available to everything and create the datasets in there.
Is this a good solution to the problem?  Has anyone used a different model successfully?

Any opinions will be gratefully received.
Ben Cooper

RE: Which layer to use for strongly typed datasets in n-tier design?

3 tier != 3 projects/assemblies. the paradigm of 3 tiers logical, not physical. I recommend the onion architecture (1, 2, 3) as a logical systems model. I find this better represents modern application development.

Data sets/tables are just an implementation detail. whether you use datasets, pocos, or EF/LLBL context specific objects is indifferent to the high level system layout. I prefer POCOs for business worksflow and datatables for reporting. the only reason for that is reporting tools in .net usually work better with datatables, then POCOs.

Jason Meckley
Programmer

FAQ855-7190: Database Connection Management
FAQ732-7259: Keeping the UI responsive

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