>>> as (if I'm right) you need to redefine your database structure.
>>No
>
>I meant you have to replicate your database structure in the code no? :)

No. Are you confusing 'Linq to SQL' with 'Linq to Datasets' ? Did you read the link I provided?
Also Examples of using the linq extensions here :http://msdn.microsoft.com/en-us/vbasic/bb688086

>>So you tried using Linq ?
>
>Not yet, but I will ... before I grow up, as that may never happen.... (thought I'd say it before anybody else would).
:-}
If you're using .NET you should be using Linq. Not just for Datasets but nearly all collection handling where selection or filtering is involved.