1. Apart from CORBA, classes and interfaces support inheritance and abstract classes . 2. Inheriting from ProviderBase are the MembershipProvider and RoleProvider abstract classes . 3. Using an interface or an abstract class can prevent this side effect. 4. The Window class will implement a Window implementation ( WindowImp ) abstract class . 5. However, abstract classes and interfaces can be reused to implement certain patterns. 6. The provider model begins with the abstract class ProviderBase. 7. Abstract members are members of abstract classes that do not have any implementation. 8. A direct implementation packages the policy classes with service abstracts classes in one library. 9. Objects cannot be created from an abstract class ; they can only be derived from. 10. The same abstract definition can be used as a common abstract class as the common interface.
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