Part I in Visual Studio .NET

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Introducing Microsoft Visual C# and Microsoft Visual Studio 2008
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code and logic for a graphical application, and you use the Design View window to lay out your user interface. You can switch between the two views whenever you want. In the following set of exercises, you ll learn how to create a graphical application by using Visual Studio 2008. This program will display a simple form containing a text box where you can enter your name and a button that displays a personalized greeting in a message box when you click the button. Note Visual Studio 2008 provides two templates for building graphical applications the
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Windows Forms Application template and the WPF Application template. Windows Forms is a technology that rst appeared with the .NET Framework version 1.0. WPF, or Windows Presentation Foundation, is an enhanced technology that rst appeared with the .NET Framework version 3.0. It provides many additional features and capabilities over Windows Forms, and you should consider using it in preference to Windows Forms for all new development.
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Create a graphical application in Visual Studio 2008
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If you are using Visual Studio 2008 Standard Edition or Visual Studio 2008 Professional Edition, perform the following operations to create a new graphical application: 1. On the File menu, point to New, and then click Project. The New Project dialog box opens. 2. In the Project Types pane, click Visual C#. 3. In the Templates pane, click the WPF Application icon. 4. Ensure that the Location eld refers to your Documents\Microsoft Press\Visual CSharp Step by Step\ 1 folder. 5. In the Name eld, type WPFHello. 6. In the Solution eld, ensure that Create new solution is selected. This action creates a new solution for holding the project. The alternative, Add to Solution, adds the project to the TextHello solution. 7. Click OK. If you are using Visual C# 2008 Express Edition, perform the following tasks to create a new graphical application. 1. On the File menu, click New Project. 2. If the New Project message box appears, click Save to save your changes to the TextHello project. In the Save Project dialog box, verify that the Location eld is set to Microsoft Press\Visual CSharp Step By Step\ 1 under your Documents folder, and then click Save.
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1
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Welcome to C#
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3. In the New Project dialog box, click the WPF Application icon. 4. In the Name eld, type WPFHello. 5. Click OK. Visual Studio 2008 closes your current application and creates the new WPF application. It displays an empty WPF form in the Design View window, together with another window containing an XAML description of the form, as shown in the following graphic: Tip Close the Output and Error List windows to provide more space for displaying the Design
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View window.
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XAML stands for Extensible Application Markup Language and is an XML-like language used by WPF applications to de ne the layout of a form and its contents. If you have knowledge of XML, XAML should look familiar. You can actually de ne a WPF form completely by writing an XAML description if you don t like using the Design View window of Visual Studio or if you don t have access to Visual Studio; Microsoft provides an XAML editor called XMLPad that you can download free of charge from the MSDN Web site. In the following exercise, you ll use the Design View window to add three controls to the Windows form and examine some of the C# code automatically generated by Visual Studio 2008 to implement these controls.
Part I
Introducing Microsoft Visual C# and Microsoft Visual Studio 2008
Create the user interface
1. Click the Toolbox tab that appears to the left of the form in the Design View window. The Toolbox appears, partially obscuring the form, and displaying the various components and controls that you can place on a Windows form. The Common section displays a list of controls that are used by most WPF applications. The Controls section displays a more extensive list of controls. 2. In the Common section, click Label, and then click the visible part of the form. A label control is added to the form (you will move it to its correct location in a moment), and the Toolbox disappears from view. Tip If you want the Toolbox to remain visible but not to hide any part of the form, click the Auto Hide button to the right in the Toolbox title bar (it looks like a pin). The Toolbox appears permanently on the left side of the Visual Studio 2008 window, and the Design View window shrinks to accommodate it. (You may lose a lot of space if you have a lowresolution screen.) Clicking the Auto Hide button once more causes the Toolbox to disappear again. 3. The label control on the form is probably not exactly where you want it. You can click and drag the controls you have added to a form to reposition them. Using this technique, move the label control so that it is positioned toward the upper-left corner of the form. (The exact placement is not critical for this application.) Note The XAML description of the form in the lower pane now includes the label control, together with properties such as its location on the form, governed by the Margin property. The Margin property consists of four numbers indicating the distance of each edge of the label from the edges of the form. If you move the control around the form, the value of the Margin property changes. If the form is resized, the controls anchored to the form s edges that move are resized to preserve their margin values. You can prevent this by setting the Margin values to zero. You learn more about the Margin and also the Height and Width properties of WPF controls in 22, Introducing Windows Presentation Foundation. 4. On the View menu, click Properties Window. The Properties window appears on the lower-right side of the screen, under Solution Explorer (if it was not already displayed). The Properties window provides another way for you to modify the properties for items on a form, as well as other items in a project. It is context sensitive in that it displays the properties for the currently selected item. If you click the title bar of the form displayed in the Design View window, you can see that the Properties window displays the properties for the form itself. If you click the label control, the window displays the properties for the label instead. If you click anywhere else on the form, the Properties window displays the properties for a mysterious
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