getting started with the entity framework 4.1 using asp.net

[...]... and edit the edmx file The Getting Started With the Entity Framework and Continuing With the Entity Frameworktutorial sets use Database First development Model First 12 If you don't yet have a database, you can begin by creating a model using the Entity Framework designer in Visual Studio When the model is finished, the designer can generate DDL (data definition language) statements to create the database... locate the source of a problem if an exception occurs while the code is writing to the database Make the following changes in the Global.asax.cs file to cause this initializer code to run when the application begins: • Add using statements: 26 usingSystem.Data .Entity; usingContosoUniversity.Models; usingContosoUniversity.DAL; • In the Application_Start method, call an Entity Framework method that runs the. .. The EdmMetadata table is used by the Entity Framework to determine when the model and the database are out of sync Right-click one of the tables and select Show Table Data to see the data that was loaded in the table by the SchoolInitializer class When you're finished, close the connection (If you don't close the connection, you might get an error the next time you run the project) 32 Conventions The. ..10 The UI style of this site has been kept close to what's generated by the built-in templates, so that the tutorial can focus mainly on how to use the Entity Framework Entity Framework Development Approaches 11 As shown in the following diagram, there are three ways you can work with data in the Entity Framework: Database First, Model First, and Code First... provides them with Entity Framework functionality This means that these classes technically aren't persistence ignorant and so don't conform fully to one of the requirements of domain-driven design All development approaches of the Entity Framework can also work with POCO (plain old CLR objects) classes, which essentially means that they are persistence-ignorant because they don't inherit from the EntityObject... located in the App_Data folder Initializing the Database with Test Data The Entity Framework can automatically create (or drop and re-create) a database for you when the application runs You can specify that this should be done every time your application runs or only when the model is out of sync with the existing database You can also write a class that includes a method that the Entity Framework. .. Database.SetInitializer(newSchoolInitializer()); The application is now set up so that when you access the database for the first time in a given run of the application, the Entity Framework compares the database to the model (your SchoolContext class) If there's a difference, the application drops and re-creates the database Note When you deploy an application to a production web server, you must remove code that seeds the database... context.Enrollments.Add(s)); context.SaveChanges(); } } } The Seed method takes the database context object as an input parameter, and the code in the method uses that object to add new entities to the database For each entity type, the code creates a collection of new entities, adds them to the appropriate DbSet property, and then saves the changes to the database It isn't necessary to call the SaveChanges method after each... entities 22 Creating the Database Context The main class that coordinates Entity Framework functionality for a given data model is the database context class You create this class by deriving from the System.Data .Entity. DbContext class In your code you specify which entities are included in the data model You can also customize certain Entity Framework behavior In the code for this project, the class is named... mapping information The What's New in the Entity Framework 4 tutorial includes a brief example of Model First development Code First Whether you have an existing database or not, you can code your own classes and properties that correspond to tables and columns and use them with the Entity Framework without an edmx file That's why you sometimes see this approach called code only, although the official name . w0 h1" alt="" Getting Started with the Entity Framework 4. 1 Using ASP. NET MVC Tom Dykstra Summary: In this book, you'll learn the basics of using Entity Framework. is a basic ASP. NET MVC Tutorial. If you prefer to work with the ASP. NET Web Forms model, see the Getting Started with the Entity Framework and Continuing with the Entity Framework tutorials display and edit data in an ASP. NET MVC application. Category: Step-by-Step Applies to: ASP. NET 4. 0, MVC 3, Entity Framework 4. 1, Visual Studio 2 010 Source: ASP. NET site (link to source content)