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Granted, the Form is not altogether that interesting at this point. But simply by deriving from Form, you have a minimizable, maximizable, resizable, and closable main window (with a default system-supplied icon to boot!). Unlike other Microsoft GUI frameworks you may have used in the past (Microsoft Foundation Classes, in particular), there is no need to bolt in hundreds of lines of coding infrastructure. Unlike a C-based Win32 API Windows application, there is no need to manually implement WinProc() or WinMain() procedures. Under the .NET platform, those dirty details have been encapsulated within the Form and Application types.

s Note The important detail is what the combo box is displaying as its content, not what it has as its data

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Currently, the MainWindow class defines the Main() method directly within its scope. If you prefer, you may create a dedicated module (I named mine Program) that is responsible for the task of launching the main window, leaving the Form-derived class responsible for representing the window itself: Imports System.Windows.Forms Namespace MyWindowsApp Public Class MainWindow Inherits Form End Class Public Module Program ' Run this application and identify the main window. Sub Main() Application.Run(New MainWindow()) End Sub End Module End Namespace By doing so, you are abiding by an OO design principle termed the separation of concerns. Simply put, this rule of OO design states that a class should be in charge of doing the least amount of work possible. Given that you have refactored the initial class into two unique classes, you have decoupled the Form from the class that creates it. The end result is a more portable window, as it can be dropped into any project without carrying the extra baggage of a project-specific Main() method.

Shows all nodes Shows Element nodes Shows Text nodes Shows Comment nodes Shows ProcessingInstruction nodes Shows CDATASection section nodes Shows EntityReference nodes

source. For example, imagine you fill a ComboBox control with Product objects and set the DisplayMemberPath property to ModelName so the combo box shows the ModelName property of each item. Even though the combo box retrieves its information from a group of Product objects, your markup creates an ordinary text list. As a result, the selection box will behave the way you expect it to behave. It will show the ModelName of the current product, and if IsEditable is True and IsReadOnly is False, it will allow you to edit that value.

The Application class defines numerous shared members that allow you to control various lowlevel behaviors of a Windows Forms application. For example, the Application class defines a set of events that allow you to respond to events such as application shutdown and idle-time processing. In addition to the Run() method, here are some other methods to be aware of: DoEvents(): Provides the ability for an application to process messages currently in the message queue during a lengthy operation. Exit(): Terminates the Windows application and unloads the hosting AppDomain. EnableVisualStyles(): Configures your application to support Windows XP visual styles. Do note that if you enable XP styles, this method must be called before loading your main window via Application.Run(). The Application class also defines a number of properties, many of which are read-only in nature. As you examine Table 21-2, note that most of these properties represent an application-level trait such as company name, version number, and so forth. In fact, given what you already know about assembly-level attributes (see 14), many of these properties should look vaguely familiar. Table 21-2. Core Properties of the Application Type

The user won t be able to interact with the content that appears in the selection box. For example, if the content of the currently selected item includes a text box, you won t be able to type in it. If the currently selected item includes a button, you won t be able to click it. Instead, clicking the selection box will simply open the drop-down list. (Of course, there are countless good usability reasons not to put user-interactive controls in a drop-down list in the first place.) If the IsEditable property is True, the behavior of the ComboBox control changes. Instead of showing a copy of the selected item, the selection box displays a textual representation of it. To create this textual representation, WPF simply calls ToString() on the item. Figure 18-3 shows an example with the same combo box that s shown in Figure 18-2. In this case, the display text DataBinding.Product is simply the fully qualified class name of the currently selected Product object, which is the default ToString() implementation unless you override it in your data class.

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