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Is it worth spending time in these frameworks. Or they just another framework like microsoft developed in the form of MFC library.
I dont want to waste precious time, so please help. Under what scenarios these frameworks will be helpful.
EF and L2S are Object-Relational Mappers (ORM). They would be used wherever an ORM is used. StackOverflow uses Linq to SQL as its ORM layer, to good effect. Entity Framework is up-and-coming, and although it currently has issues, it will be greatly improved in the upcoming version 4.0.
Your time would be well spent learning one or both of these frameworks, as it will be highly likely you will use an ORM in your applications at some point.