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If the customer does buy the product, that fact is stored in the database and makes the database more valuable The ful llment house process is fully automated and therefore is cheaper and faster The manufacturer can get daily reports on the success of the rebate program by product, state, region, and type of consumer When registering for the certi cate, the consumer can be asked for more information, such as income, age, and so on The certi cates should not offer discounts Discounts erode value A better offer would be a premium, such as training or software that would go with the camera, or a rebate..

As explained in recipe 1-6, you can separate parts of your code into reusable GameComponent classes. Examples of such components can be a camera, particle system, user input processing, billboard engine, and more. One of the main benefits of using GameComponent classes is that you can easily switch between, for example, camera modes. Changing from a first-person camera to a quaternion camera involves changing just one line of code in the Initialize method of your main Game class. Using GameComponent classes to achieve this is one thing, but you need to make sure you don t have to change the rest of your code (which uses the camera) when you switch from one component to another.

Figure 15-16. The syntax for lambda expressions consists of the lambda operator with the parameter section on the left and the lambda body on the right.

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Events Are Like Delegates Overview of Source Code Components Declaring an Event Raising an Event Subscribing to an Event Standard Event Usage The MyTimerClass Code Event Accessors

Less than 5 percent of the people who visit an online retail site actually buy something. Compare this with the performance of someone who drives up and parks at Wal-Mart or a supermarket. No one walks away from this trip empty-handed. Why don t people buy on the Web Many sites are still too dif cult to navigate. Flashy graphics that take minutes to download turn people off. The rigidity of shopping online is frustrating. My experience is typical. When Orbitz.com opened its travel site, I was one of the rst to use it. I ordered a cheap Thanksgiving ight to Manchester, New Hampshire, for Helena and me. Then I called my son David, who said that the timing was wrong. Orbitz.com would not let me change my ight times, despite several emails. I ended up wasting $400. My travel agent has always been able to make changes in nonrefundable ights. The irony of the situation is that when Thanksgiving rolled around, I received a maddening email from Orbitz.com telling me to get ready for my wonderful trip to Manchester. I will never again use Orbitz.com for anything. Its in exible method of operation turned me off permanently. Its customer service was totally unresponsive. This is not what the Web should be.

The preceding chapter covered delegates. Many aspects of events are similar to those of delegates. In fact, an event is like a simpler delegate that is specialized for a particular use. Figure 16-1 illustrates that, like a delegate, an event has methods registered with it and invokes those methods when it is invoked. The following are some important terms related to events: Raising an event: The term for invoking or firing an event. When an event is raised, all the methods registered with it are invoked in order. Publisher: A class or struct that makes an event available to other classes or structs for their use. Subscriber: A class or struct that registers methods with a publisher. Event handler: A method that is registered with an event. It can be declared in the same class or struct as the event or in a different class or struct.

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