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For example, the following code shows two reference variables, myVar1 and myVar2, that point to the same object in memory. The code is illustrated in Figure 18-17. To myVar1, the object it references looks like an object of type B which it is. To myVar2, the same object looks like an object of type A. Even though it is actually pointing at an object of type B, it cannot see the parts of B that extend A and therefore cannot see Field2. The second WriteLine statement would therefore cause a compile error.

You save this as a normal Texture2D, called textureRenderedInto Next, you ll draw the textureRenderedTo in the quad covering your whole window by using a post-processing effect In this simple recipe, you ll be defining an effect, called Invert, that inverts the color of every pixel in the image:.

Notice that the conversion does not change myVar1. class A { public int Field1; }

Figure 14-8

class B: A { public int Field2; } class Program { static void Main( ) { B myVar1 = new B(); Return the reference to myVar1 as a reference to a class A. A myVar2 = (A) myVar1; Console.WriteLine("{0}", myVar2.Field1); Console.WriteLine("{0}", myVar2.Field2); myVar2 can t see Field2. // Fine // Compile error!

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Just as there are implicit numeric conversions that the language will automatically perform for you, there are also implicit reference conversions. These are illustrated in Figure 18-18. All reference types have an implicit conversion to type object. Any interface can be implicitly converted to an interface from which it is derived. A class can be implicitly converted to Any class in the chain from which it is derived Any interface that it implements

performance of the responders. Use a control group to see if the nonresponders also do better. They will. Figure 14-8 shows the kind of information that the New York Times gets from its readers on the Web.

A delegate can be implicitly converted to the .NET BCL classes and interfaces shown in Figure 18-19. An array, ArrayS, with elements of type Ts, can be implicitly converted to the following: The .NET BCL class and interfaces shown in Figure 18-19. Another array, ArrayT, with elements of type Tt, if all of the following are true: Both arrays have the same number of dimensions. The element types, Ts and Tt, are reference types not value types. There is an implicit conversion between types Ts and Tt.

If a delegate has a return value and more than one method in its invocation list, the following occurs: The value returned by the last method in the invocation list is the value returned from the delegate invocation. The return values from all the other methods in the invocation list are ignored.

One of the most innovative and practical methods of customer pro ling through Web response is the Web quiz. People are encouraged to go to a Web site to take a quiz. In most cases, the quiz concerns your product. When they take the quiz, they get a score that tells them whether they need your product and which of your products meets their needs. Iomega, the maker of Zip storage disks, turned to Bob McKim of msdbm of Los Angeles to design a Web quiz that would attract business customers. Msdbm has perfected this technique. The company used direct mail and email to prompt IT directors to come to Iomega s Web site to take a quiz (see Figure 14-9). The quiz asked the easy questions about data storage given in the following list. As you look through these questions and think about your answers, you will see that you are easily drawn into the Iomega way of thinking. Each question has a yes or no answer. 1. At least once a quarter we make copies of all our data and store them off site.

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