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Figure 16-5. The code structure of MyTimerClass The Timer class is a useful tool, so I ll mention a little more about it. First, it has a public event called Elapsed. If that sounds familiar, it s because I named the event in MyTimerClass after it. The names have no other connection than that. I could have named the event in MyTimerClass anything. One of the properties of Timer is Interval, which is of type double, and specifies the number of milliseconds between raising the event. The other property the code uses is Enabled, which is of type bool, and starts and stops the timer.

namespace BookCode { public class Game1 : Microsoft.Xna.Framework.Game { GraphicsDeviceManager graphics; ContentManager content; BasicEffect basicEffect; GraphicsDevice device; CoordCross cCross; Matrix viewMatrix; Matrix projectionMatrix; public Game1() { graphics = new GraphicsDeviceManager(this); content = new ContentManager(Services); } The Projection matrix will need to be changed only when the aspect ratio of the target window changes. If this is not going to happen, you have to define it only once, such as during the initialization phase of your program. protected override void Initialize() { base.Initialize(); float viewAngle = MathHelper.PiOver4; float aspectRatio = graphics.GraphicsDevice.Viewport.AspectRatio; float nearPlane = 0.5f; float farPlane = 100.0f; projectionMatrix = Matrix.CreatePerspectiveFieldOfView(viewAngle, aspectRatio, nearPlane, farPlane); } protected override void LoadContent(bool loadAllContent) { if (loadAllContent) { device = graphics.GraphicsDevice; basicEffect = new BasicEffect(device, null); cCross = new CoordCross(device); } }

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Failing to capture customers email names and use them in your marketing program Using database marketing for packaged goods, with some exceptions Paying more than half the LTV to acquire a rented name Starting any dot com without rst computing the value of the email names to be acquired Thinking that email response rates will be as high as direct-mail response rates Failing to use control groups with any database marketing program

The actual code is the following. The only things I haven t shown previously are the private timer field, called MyPrivateTimer, and the constructor for the class. The constructor does the work of setting up the internal timer and attaching it to event handler OnOneSecond. public class MyTimerClass { public event EventHandler Elapsed; private void OnOneSecond(object source, EventArgs args) { if (Elapsed != null) Elapsed(source, args); } //-----------private System.Timers.Timer MyPrivateTimer; // Private timer

public MyTimerClass() // Constructor { MyPrivateTimer = new System.Timers.Timer(); // Create the private timer. // The following statement sets our OnOneSecond method above as an event // handler to the Elapsed event of class Timer. It is completely // unrelated to our event Elapsed, declared above. MyPrivateTimer.Elapsed += OnOneSecond; // Attach our event handler. // Property Interval is of type double, and specifies the number of // milliseconds between when its event is raised. MyPrivateTimer.Interval = 1000; // 1 second interval. // Property Enabled is of type bool, and turns the timer on and off. MyPrivateTimer.Enabled = true; // Start the timer. } }

1. Compute the lifetime value, after 3 years, of newly acquired customers given these facts: 400,000 customers; retention rates 62 percent, 70 percent, 74 percent; average purchase $320,

The last topic to cover in this chapter is event accessors. I mentioned earlier that the += and -= operators were the only operators allowed for an event. These operators have the well-defined behavior that you ve seen so far in this chapter. You can, however, change these operators behavior and have the event perform whatever custom code you like when they are used. You can do this by defining event accessors for the event. There are two accessors: add and remove. The declaration of an event with accessors looks similar to the declaration of a property.

The following example shows the form of an event declaration with accessors. Both accessors have an implicit value parameter called value that takes a reference to either an instance method or a static method. public event EventHandler Elapsed { add { ... } remove { ... } }

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When event accessors are declared, the event does not contain an embedded delegate object. You must implement your own storage mechanism for storing and removing the methods registered with the event. The event accessors act as void methods, meaning that they cannot use return statements that return a value.

You can declare multiple fields of the same type in the same statement by separating the names with commas. You cannot mix different types in a single declaration. For example, you can combine the four preceding field declarations into two statements, with the exact same semantic result: int F1, F3 = 25; string F2, F4 = "abcd";

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