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In the previous chapter, you created a project to hold your source code. I ll now take a moment to explain what a project is and what information it contains. The project is a container for all items in your application, such as forms, source code, and resources. It also stores important configuration data that belongs to the application as a whole: the location of the executable (i.e., binaries) on your hard drive, the version information, and many more settings that affect all of the characteristics of your application. For instance, it s also storing programmer-defined application settings that are very important for the user experience. Users love to customize their software environment to their comfort level and personal style. A typical utilization of those user settings is to make sure the application can preserve user customization from one execution to another. A good example of custom user settings can be seen with your own user preferences in Internet Explorer, such as your home page address, your home page settings, which toolbars are displayed, and whether your toolbars are locked in size and so forth. In the next chapter, you ll learn about some of the most important settings stored in the project configuration file and how to use them in your application. In the final chapter of this book, you will use programmatic techniques to preserve the user s settings and customizations. The name you choose when creating your application is going to become your project name. It will also become the default folder name on your hard drive where your application will be stored when you save your application. It will also become the default namespace of your application. A namespace is used to organize the classes in a single hierarchical structure. It does the same for any other types you might define. The creation of a namespace helps prevent naming collisions. What is a naming collision Let s look at an example to illustrate this concept. Suppose a company called AdventureWorks wrote a new Windows Forms class named ANewForm. They would create a namespace called AdventureWorks and put their ANewForm class in it to uniquely name their class. The fully qualified name of a class is always composed of the namespace followed by a dot and then the name of the class(es). AdventureWorks s unique class would be AdventureWorks.ANewForm.
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Now let s suppose that you are creating a new project using Visual Studio and decide to name your project MyLibrary. Visual Studio would then create for you a namespace called MyLibrary. Suppose that you then define a new class and name it ANewForm. You might not be aware that a company called AdventureWorks also called their new class using the same name. Even though AdventureWorks might be doing completely different things with their class, a problem could arise because the two classes are named the same. Now suppose that you re trying to use both classes called ANewForm in your new application. If you simply use ANewForm, the compiler will not be able to determine which ANewForm class you want to use--the one from your library or the one from the AdventureWorks library; this is a naming collision. By prefixing the class name with the namespace name, you are then telling the compiler exactly which class you want to use (AdventureWorks.ANewForm).
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You will soon create a new design layout in the form designer. In doing this, you ll be creating what the application contains and how its content is presented when the user executes the application. To accomplish this phase of a project, you typically do not need to type a great deal of code; as explained later in this chapter, Visual Studio takes care of that for you. You simply have to worry about how your application looks. When you're done designing all the visual aspects to your liking, your next task usually involves attaching the source code to your visual layout so that your application reacts to and acts upon the user s input. In this chapter, you will complete the basic layout. You will learn more advanced layout techniques in following chapters. Let s start the next project: a simple Web browser.
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