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I'm reading about the Entity Framework 4.0 and I was wondering why should I create a complex type and not a new Entity (Table) and a relation between them?
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Complex types are non-scalar properties of entity types that enable scalar properties to be organized within entities. Like entities, complex types consist of scalar properties or other complex type properties.
There are three approaches to model your entities in Entity Framework: Code First, Model First, and Database First. This article discusses all these three approaches and their pros and cons.
The perfect example is an address. Using a complex type for an address is much easier to deal with than a new entity. With complex types you do not have to deal with the Primary Key. Think about accessing an address how many common types of entities would have an address (Business Units, People, Places). Imagine populating many peoples addresses and needing to set a key for each one. With complex types you simply access the internal properties of they type and you're done. Here is an MSDN link of an example. http://msdn.microsoft.com/en-us/library/bb738613.aspx
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