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CHAPTER 2 WEB DEVELOPMENT IN .NET
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There is one extra bit of work to do in the second line. Notice that the selected color value is a string, but the ForeColor attribute expects an object of type System.Drawing.Color. Therefore, you use the static FromName() method of that class to create a Color object based on the string name of the color. The System.Drawing namespace is imported for all web projects by default. We ll revisit many of these concepts in later chapters. In particular, in the next chapter, we ll concentrate on the different types of controls and how they re used.
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A Brief Tour of An ASP.NET Application
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ASP .NET is an order of magnitude more structured than any other web development environment Microsoft has ever produced. You ve already seen that it is object-oriented, event-driven, and control-based. Its design also heavily promotes the benefits of code reuse and compiled versus interpreted code execution. In the remaining pages in this chapter, you ll take a brief tour of some of these aspects of ASP .NET.
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ASP.NET Application Files
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You ve already seen some of the files in an ASP .NET application; specifically, each web form consists of an .aspx file and its associated .aspx.vb code-behind file. A quick look at the Solution Explorer (or, indeed, through Windows Explorer, a look at the folder that contains the application) indicates that a number of other files are created by default when VS .NET creates a new VB ASP .NET web application. Let s look at some of these files. Return to the Solution Explorer, click the Show All Files button, and expand the resulting nodes. You ll see a number of files that were previously hidden from view.
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Notice that besides the Ch2WebForm.aspx.vb code-behind file that was created automatically when you created your web form, there s another file associated with the web form: an .resx file. This is known as a resource file, which contains any other information external to the form itself. VS .NET uses it for its drag-and-drop visual designer.
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CHAPTER 2 WEB DEVELOPMENT IN .NET
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What other files do you see here Here s a brief r sum of the more important files, from the point of view of this book: References files: Under the References node are a number of child nodes. Each one looks as if it relates to a namespace. In fact, these are the names of the assemblies that are linked to the application. Each assembly contains compiled code. These five hold the compiled classes contained in five namespaces. (For convenience, many of .NET s namespace classes are compiled into assemblies of the same name as the namespace; for example, the System.Data namespace classes are compiled into System.Data.dll.) The five shown in the example are the five assemblies linked to an ASP .NET application by default when it s created in VS .NET, so the classes in these namespaces are available to you immediately. Global.asax and Global.asax.vb: Further down the list, the next important files are Global.asax and Global.asax.vb. This pair is where you put the methods that handle application-level and session-level events (for example, the Application_Start() method, which runs when the application starts up, and the Session_Start() method, which runs whenever a new user session starts). It s also the usual place to keep global variables. You ll find some uses for Global.asax during the development of the Friends Reunion application, in subsequent chapters. Web.config: At the bottom of the list, the Web.config file is used to customize the configuration of your web application. It can contain all sorts of information about application settings, security settings, session-state timeout settings, compilation settings, errorhandling options, and so on. You ll see this file mentioned in quite a number of the following chapters, whenever you need to apply application-specific settings.
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Note You ll also notice the AssemblyInfo.vb file in the Solution Explorer for a newly created ASP.NET
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application. This file contains assembly attributes relating to the compiled web application code. It controls versioning, signing of the assembly, culture information, and so on.
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