There is so much to write home about in EF 4, from myriad designer improvements to API changes. If I had to pick a shortened list, it would include the greatly improved stored procedure support, added support for n-tier development, support for POCO classes—which leads to agile development and unit testing—the use of T4 to generate code from an EDM, foreign key support, model-first design, and Code-Only support, which provides the ability to use EF without a model. Code-Only support elicits joy from domain-driven developers.
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