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Entity Framework 3.5 or 4.0?

I am starting a new project and the client wants to use the Entity Framework for their business layer. They currently use the .NET Framework 3.5. Would it be wise to upgrade to 4.0 for the Entity Framework? What are the significant changes between the two versions?

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c # entity-framework entity-framework-4
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Entity 4.0 supports POCO (regular CLR objects) , which is a big plus if you first model (as opposed to a database, first), for example , a Domain Managed Project .

Here 's an article that compares Entity 1.0 and 4.0. As for 4.0, he states (and discusses) the following new features:

  • Ignorance
  • POCO (regular CLR object)
  • T4 code generation
  • Independent objects
  • Model First Development
  • FK Associations
  • Code only
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