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This tells us that the page is derived from the BehindForm class located in the file, behindform.cs. Note that we don t use a CodeBehind attribute. It is used by Visual Studio .NET to help locate the files involved, and is unnecessary here. We ve also deleted the script code from the file and moved it to behindform.cs, shown in listing 8.22.

Figure 7-9. Display formatting marks by selecting the check box at the bottom of the Reveal Formatting task pane.

By default, all available formatting marks tabs, spaces, paragraph marks, hidden text, and hyphens are shown when you select Show All Formatting Marks in the Reveal Formatting task pane. You can change which marks are displayed by following these steps:

1 Choose Tools, Options. The Options dialog box appears, as shown in Figure 7-10. 2 Click the View tab, if necessary. In the Formatting Marks section, select check boxes

Figure 7-10. Switch to the View tab in the Options dialog box to change which formatting marks are displayed.

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// file : behindform.cs using System; using System.Web.UI; using System.Web.UI.WebControls; public class BehindForm : Page { protected TextBox firstNameTextBox; protected Label greetingLabel; // greet the user... protected void greetHandler(object sender, EventArgs e) { firstNameTextBox.Text = firstNameTextBox.Text.Trim(); if (firstNameTextBox.Text == "") { // no name, so no greeting... greetingLabel.Text = ""; } else { // greet the user... greetingLabel.Text = "Hello, " + firstNameTextBox.Text + "!"; } } }

Tip Avoid screen clutter Some people are able to work with formatting marks on and barely notice them; others are distracted by the dots and symbols stuffed between words and paragraphs in their text. You can hide formatting marks quickly by clicking the Show/Hide button on the Standard toolbar.

Another option available to you in the Reveal Formatting task pane is the ability to compare and contrast similar text styles with subtle differences. Have you ever studied a heading, won dering why it doesn t look quite right compared to another heading in your document Now Reveal Formatting enables you to click on one text item, and then compare it to another, showing the differences in font styles and sizes, spacing, and so forth. To compare the formats of two text segments in your document, follow these steps:

box in the Reveal Formatting task pane. Another text selection box opens in the task pane, showing a duplicate of the text you selected.

The Trace class allows you to instrument release builds to monitor the health of your application at run time In Visual Studio NET, tracing is enabled by default When using the command-line build you must add the /d:Trace flag for the compiler or #define TRACE in the your Visual C# NET source code to enable tracing For Visual Basic NET source code, you must add /d:TRACE=True for the commandline compiler For more information, see Knowledge Base article 815788, HOW TO: Trace and Debug in Visual C# NET, at http://supportmicrosoftcom /defaultaspx scid=kb;en-us;815788..

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Since this is a regular C# class, we use the using statement to identify the namespaces used. Note that, the class derives from Page and declares protected members for the text box and label. The greetHandler method is also marked protected. Recall that the .aspx file itself defines a class that inherits from our codebehind class. Therefore, the page will inherit these members. If you place both files into a new virtual IIS directory and use your browser to test the application, you should get results identical to those we saw earlier.

shows the formatting differences between the two selections, as shown in Figure 7-11.

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Figure 7-11. The Reveal Formatting task pane displays the formatting differ ences between two text selections.

Tip The Reveal Formatting task pane is perfect for comparing the format of one piece of text with another. But when you want to see and compare the contents of documents (and not just the format), choose Compare Side By Side from the Window menu to view two open documents together on the screen.

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