This text is discussing a solution to an exercise in a previous section. The author explains that they have hard-coded a list of customers in the index action and want to instead get the customers from the database. They declare a DB context and initialize it in the constructor. They also mention that in the future, they will show how to delegate object instantiation and disposal to a dependency injection framework. They then make changes to the index action to initialize the customers variable using the context. They explain how Entity Framework uses deferred execution and how the query is executed when iterating over the customers object. They mention the option to immediately execute the query using the ToList() method. They make similar changes to the details action and mention that they can get rid of the get customers method. Finally, they test the application by populating the customers table in the database and run the application.
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