Using in Visual Basic .NET

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Using
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The word using can serve as either a compiler directive or a keyword in a program.
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Appendix B
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Glossary
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C# provides the using directive:
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using Audio;
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The using directive must appear at the start of a source file. It identifies a namespace that is to be used to resolve the names of classes in that file. If the Audio namespace contains a class called Device, I could add a using directive to my program so that I can create instances of Device without having to add Audio to the name. I can still use other Device classes, such as Graphics.Device, but I will need to give its fully qualified name. You can add multiple using directives at the start of a source file; when you create a new project, you will often find that a number of them have been added automatically. If there is a name clash (for example, you use two namespaces, both of which contain a class called Audio), the compiler will require you to use the fully qualified name for that particular class. It can also be sensible to use the fully qualified name in circumstances where you want a reader of the program source to easily identify where a class is defined. C# also provides the using keyword, which lets you state precisely where in a program a variable is being used.
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using (PellMellGame game = new PellMellGame()) { game.Run(); }
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The using keyword introduces the declaration of a variable to be used in the block that follows the using statement. When the block is complete, the variable is no longer required and can be removed by the runtime environment. Without the using statement, the Garbage Collector would have to deduce that there were no remaining references to the variable game in the preceding code.
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Value Type A value type holds a simple value. Value types are passed as values into method calls, and their values are copied on assignment; that is, x = y causes the value in y to be copied into x. Subsequent changes to the value in x will not affect the value of y. Note that this is in contrast to reference types, where the result of the assignment would make x and y refer to the same instance.
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A variable holds a value that is being used by a program. A given variable has a unique identifier and is declared as having a particular type. Variables can be local to a block, or they can be members of a class.
Void A programmer who wants to create a method that does not return a value can tell the compiler this by making the type of the method void. A void method is one that performs a task but does not return a value. While The while keyword is used in looping constructions, which are described in the
Variable
Do while entry in this glossary.
Appendix B
Glossary
Widening is the reverse of narrowing. When a value is widened, it is moved from a type with a narrower range and precision into one that has a wider range, such as from the byte type (with a range of 0 to 255) into an integer type (with a range of 2,147,483,648 to 2,147,483,647). The compiler is quite happy to produce code that will perform this conversion since there is no chance of data being lost.
Workspace A workspace is analogous to an XNA Game Studio 2.0 solution in that it contains programming resources and projects that are used to create a solution. Xbox Live
Widening
Xbox Live is a networking solution for Xbox 360 and PC games. Gamers pay an annual subscription that gives them an identity on the Xbox Live network and allows them to engage in network play using Xbox games. They can also download game demos and other content that is then stored on the hard disk of their Xbox 360. An Xbox Live account is required if you wish obtain an XNA Creators Club membership. The best game development environment in the world. Bar none.
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