POCO Entities in ADO.NET 4.0 - One of the most anticipated features of the Entity Framework 4.0 is the ability to have POCO (Plain Old CLR Object) entities. This allows developers to produce domain objects free of any persistence baggage, with no requirements imposed inheritance-wise. Up till now entity objects were required to either inherit EntityObject or had to implement IEntityWithKey, IEntityWithChangeTracker and IEntityWithRelationships. This makes it far easier to use EF with legacy domain classes and keeps data models clean and unconcerned with their own persistence. To demonstrate this feature I'll start out with a basic SQL Server table structure and test data that maps employees to departments. Database create table Departments ( Department_ID int identity primary key clustered, Name varchar(255) not null ) create table Employees ( Employee_ID int identity primary key clustered, FirstName varchar(255)...
