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Figure 6-10. Inheritance through class derivation The VolvoCar class is the most specialized, and it has inherited members from Car and System.Object. (The methods that are inherited from System.Object are explained later in this chapter and elsewhere in the book.) As we continue to add classes to represent different cars, we can place new features where they most make sense. For example, the VolvoCar class contains a feature that is unique to Volvo cars a field representing which fixed set of Volvo in-car entertainment options has been installed. If I had added this feature to the Car class, any class derived from Car would inherit the VolvoSoundSystem field. We don t want to do that because this field has no relevance to cars made by, say, Ford. If I had added the VolvoSoundSystem to a class derived from VolvoCar, I would have to duplicate the field in every other class that derives from VolvoCar. When considering where to place a field, method, or other class member, try to find the sweet spot that doesn t add irrelevant features to classes and doesn t require duplication in peer-level classes.

The more products you sell to customers, the higher their retention rate will be. Customers like to receive communications. Almost any communication will increase sales and retention rates. Referred customers have higher lifetime values and retention rates than the average customer. Offering discounts to attract new customers produces disloyal customers. Use the Web and email as a powerful two-way customer contact medium. You will have fun with this book reading the chapters, taking the quizzes, and using the charts. All the numerical charts in this book can be downloaded free from www.dbmarketing.com, where you will nd the answers to the quizzes, more than 100 magazine articles, free software, and a lot more. If done properly, database marketing will be fun for both the customer and the marketer. It is an intriguing game of communication and life. Enjoy it while you increase your sales and pro ts. I will be glad to hear from any readers on any subject at any time. You may reach me at dbmarkets@aol.com. Point out mistakes in the book, ask for help with marketing, or send me a case study that I can use in a future book. Arthur Middleton Hughes Vice President for Business Development CSC Advanced Database Solutions 2100 South Ocean Drive, Suite 16A Fort Lauderdale, FL 33316 dbmarkets@aol.com November 2002

The VolvoCar class has its own implementation of the PrintCarDetails method. The method of the same name in the base class (referred to as the base method) doesn t know how to take advantage of the specialized addition to the VolvoCar class; inheritance works in only one direction. To solve this, VolvoCar provides its own implementation of this method that builds on the base method and adds extra information that is specific to Volvo. For this to work, the virtual keyword has to be applied as a modifier to the base method (indicating that derived classes are free to provide their own versions of the method) and the method in the derived class (known as the derived method) has to use the override keyword as a modifier to indicate that it is providing a specialized implementation of the base method. Providing a more specialized version of a base method is called overriding a method; this is discussed further in 9, along with the use of the virtual and override keywords. Here is the base method from the Car class: public virtual void PrintCarDetails() { System.Console.WriteLine("--- Car Details ---"); System.Console.WriteLine("Car Owner: {0}", CarOwner); System.Console.WriteLine("Car Color: {0}", PaintColor); System.Console.WriteLine("Gas Mileage: {0} mpg", MilesPerGallon); } Here is the derived method from the VolvoCar class: public override void PrintCarDetails() { base.PrintCarDetails(); System.Console.WriteLine("VolvoSoundSystem: {0}", VolvoSoundSystem); } You can see that the derived method calls base.PrintCarDetails(). This calls the base method. Derived classes can access the members of their base class. In this case, it means that we don t have to duplicate the code statements that print out the general Car details. I didn t have to use the base implementation; I could have duplicated those statements and accessed the base class fields from the derived class.

Tip Base classes don t have to grant derived classes access to every member. See s 7 and 9 for details of access modifiers, and see this chapter and 9 for details of the sealed keyword.

The following statements create a VolvoCar object and call the PrintCarDetails method: VolvoCar myVolvo = new VolvoCar("Adam Freeman", "Black", 30, "High Performance"); myVolvo.PrintCarDetails(); The output from these methods is as follows:

Thus, you can fix the problem sooner and more cheaply because it is identified much earlier in the process.