Navigating the Web with the WebBrowser Control in .NET

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Navigating the Web with the WebBrowser Control
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The WebBrowser control provides methods that enable navigation of the Web in your application. The primary method for navigation is the Navigate method. This method takes a string argument that indicates the URL for the document to be loaded into the WebBrowser control. The following example demonstrates the Navigate method.
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' VB WebBrowser1.Navigate("www.microsoft.com") // C# webBrowser1.Navigate("www.microsoft.com");
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Once navigation is complete, the WebBrowser control raises the DocumentCompleted event. By handling this event, you can execute code after the document has loaded. You can use other methods of the WebBrowser control to access your document his tory. The GoBack method navigates to the previous page in the document history, and the GoForward method navigates to the next page in the document history. If no page is available in the document history, there is no effect.
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Working with Documents in the WebBrowser Control
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You can also use the Navigate method to load other documents into the WebBrowser control. The following example demonstrates how to load a Microsoft Office Word document into the WebBrowser control.
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' VB WebBrowser1.Navigate("C:\Test.doc") // C# webBrowser1.Navigate(@"C:\Test.doc");
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When working with documents in the WebBrowser control, you can allow the user to save the document by using the ShowSaveAsDialog method. This method displays the Save As dialog box and allows the user to choose a format to save the document. You can also use the WebBrowser control for printing documents. You can call the ShowPrintDialog and ShowPrintPreview methods to enable printing of the document. These methods show the Print dialog box and the Print Preview dialog box, respec tively, and allow the user to continue on to printing the document.
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The NotifyIcon Component
The NotifyIcon component is not a control but, rather, a component that represents an icon that appears in the system tray. The NotifyIcon component is usually used with applications that run in the background. They can provide information about the pro gram execution by displaying balloon tips, and you can associate a ContextMenuStrip with the NotifyIcon to allow the user to execute commands from a context menu. Table 3-19 shows important properties of the NotifyIcon component.
Table 3-19 Important Properties of the NotifyIcon Component
Property BallonTipIcon
Description The icon that will be shown in the balloon tip. This property can be set to None, which displays no icon, or to Info, Warning, or Error. Sets the text that is displayed in the balloon tip. Sets the title of the balloon tip. Gets or sets the ContextMenuStrip associated with the NotifyIcon.
BalloonTipText BalloonTipTitle ContextMenuStrip
Lesson 3: Configuring the WebBrowser Control and the NotifyIcon Component and Creating Access Keys
Table 3-19 Important Properties of the NotifyIcon Component
Property Icon Text Visible
Description The icon that is shown in the system tray. The text that is shown when the user s mouse rests on the icon in the system tray. Indicates whether the icon is visible in the system tray.
To display a NotifyIcon in the system tray, you must set the Icon property to the icon you want to display and set the Visible property to True. You can add icons to your project by creating a new instance of the System.Drawing.Icon class, or by adding exist ing icon files to your project from the Project>Add Existing Item menu option. The NotifyIcon component contains properties that govern the display of the balloon tip. The balloon tip can be used to display information to the user. You can set the Icon, Text, and Title of the balloon tip by setting the BalloonTipIcon, BalloonTipText, and BalloonTipTitle properties, respectively. After the appropriate properties are set, you can display the balloon tip by calling the ShowBalloonTip method. The ShowBalloonTip method takes a parameter that indicates the number of seconds that the balloon tip is shown. Following is an example of the ShowBalloonTip method:
' VB NotifyIcon1.ShowBalloonTip(12) // C# notifyIcon1.ShowBalloonTip(12);
You can associate a ContextMenuStrip with the NotifyIcon component to allow users to execute commands from the menu by right-clicking the icon. You can associate a Con textMenuStrip with the NotifyIcon component by clicking the ContextMenuStrip prop erty in the Properties window and setting the property to a ContextMenuStrip in your solution. Creating ContextMenuStrips will be discussed in detail in 4, ToolStrips, Menus, and Events.
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