Code-First Development with Entity Framework 4
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by Scott Guthrie
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Creating Model Classes

NerdDinner is a small application, and our data storage needs with it are pretty simple.  We want to be able to define and store “Dinners” that refer to specific events that people can attend.  We also want to be able to define and store “RSVP” acceptances, which are used to track a person’s interest in attending a particular Dinner.

Let’s create two classes (Dinner and RSVP) to represent these concepts.  We’ll do this by adding two new classes to our ASP.NET MVC project - “Dinner” and “RSVP”:

image

The above “Dinner” and “RSVP” model classes are “plain old CLR objects” (aka POCO).  They do not need to derive from any base classes or implement any interfaces, and the properties they expose are standard .NET data-types.  No data persistence attributes or data code has been added to them. 

The ability to define model classes without having to tie them to a particular database, database API, or database schema implementation is really powerful – and provides us with much more data access flexibility.  It allows us to focus on our application/business needs without having to worry about persistence implementation.  It also gives us the flexibility to change our database schema or storage implementation in the future – without having to re-write our model objects, or the code that interacts with them.


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