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Perhaps the most important aspect of ASPNET to remember is that it runs inside the runtime engine of the CLR The whole of the NET Framework that is, all namespaces, applications, and classes are referred to as managed code Though a full-blown investigation of the CLR is beyond the scope of this chapter, some of the benefits are as follows: Automatic memory management and garbage collection: Every time your application creates an instance of a class, the CLR allocates space on the managed heap for that object However, you never need to clear this memory manually As soon as your reference to an object goes out of scope (or your application ends), the object becomes available for garbage collection The garbage collector runs periodically inside the CLR, automatically reclaiming unused memory for inaccessible objects.

Figure A-19. The UI of the ImageOrderAutoDialog class With this, you can now update the Tools Order Automobile... Click event handler to create an instance of your derived type, rather than the OrderAutoDialog base class: private void orderAutomobileToolStripMenuItem_Click(object sender, EventArgs e) { // Create the derived dialog object. ImageOrderAutoDialog dlg = new ImageOrderAutoDialog(); ... }

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This model saves you from the low-level complexities of C++ memory handling and from the quirkiness of COM reference counting Type safety: When you compile an application, NET adds information to your assembly that indicates details such as the available classes, their members, their data types, and so on As a result, your compiled code assemblies are completely self-sufficient Other people can use them without requiring any other support files, and the compiler can verify that every call is valid at runtime This extra layer of safety completely obliterates low-level errors such as the infamous buffer overflow in C++ Extensible metadata: The information about classes and members is only one of the types of metadata that NET stores in a compiled assembly Metadata describes your code and allows you to provide additional information to the runtime or other services.

Many GUI applications require the ability to generate graphical data dynamically for display on the surface of a window. For example, perhaps you have selected a set of records from a relational database and wish to render a pie chart (or bar chart) that visually shows items in stock. Or, perhaps you want to re-create some old-school video game using the .NET platform. Regardless of your goal, GDI+ is the API to use when you need to render data graphically within a Windows Forms application. This technology is bundled within the System.Drawing.dll assembly, which defines a number of namespaces (see Figure A-20).

For example, this metadata might tell a debugger how to trace your code, or it might tell Visual Studio how to display a custom control at design time You could also use metadata to enable other runtime services (such as web methods or COM+ services) Structured error handling: If you ve ever written any moderately useful Visual Basic or VBScript code, you ll most likely be familiar with the limited resources these languages offer for error handling With structured exception handling, you can organize your error-handling code logically and concisely You can create separate blocks to deal with different types of errors You can also nest exception handlers multiple layers deep Multithreading: The CLR provides a pool of threads that various classes can use For example, you can call methods, read files, or communicate with web services asynchronously, without needing to explicitly create new threads.

Insert the URL http://www.webservicex.net/geoipservice.asmx WSDL and click on GO. The Web Services Explorer will query the public service and retrieve all available services, as shown in Figure 8-22.

Note A friendly reminder: WPF has its own graphical rendering subsystem and API; you use GDI+ only within a Windows Forms application.

Figure 1-2 shows a high-level look at the CLR and the NET Framework..

Table A-10 documents the role of the key GDI+ namespaces at a high level. Table A-10. Core GDI+ Namespaces

Every control that supports repeated-value data binding includes a DataBind() method. You could call this method to bind a specific control. However, when you call the DataBind() method on a Page object, the Page object calls DataBind() on every contained control, simplifying your life.

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