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Which is the best solution for 3-tier arch. Linq to SQL or Nhibernate?
Specifically, I will upgrade a system in 2-tier architecture to 3-tier architecture?
Edit: And where can I find good tutorials or videos for both?
If you’re only ever need to support one DB platform and have your database model already, LINQ-to-SQL makes sense.
However, you could also use FluentNHibernate to generate the mappings for you.
If support for multiple DB’s and granular and flexible control over mappings is important, go NHibernate. Else, LINQ-to-SQL will do fine. Avoid LINQ-to-Entities like the plague, for now at least (v4.0 may improve things).