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Keyword abstract class MyClass { ... } An abstract class can contain abstract members or regular, nonabstract members. The members of an abstract class can be any combination of abstract members and normal members with implementations. An abstract class can itself be derived from another abstract class. For example, the following code shows one abstract class derived from another. // Abstract class

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the EPRService namespace, and finally click the IEPRService interface, as shown in Figure 10-7. Click OK.

When you use navigation properties in a query like the one in Listing 30-4, the SQL statement that is generated to query the database includes joins to get the required data as efficiently as possible. The same is not true if you access the navigation properties as you enumerate the results from a query, as demonstrated in Listing 30-5. Listing 30-5. Using Navigation Properties When Enumerating Results using using using using System; System.Collections.Generic; System.Linq; NorthwindModel;