Working with Menus and Dialog Boxes in Visual Studio .NET

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When the details have all been written out, a message box is displayed giving the user some feedback (always a good idea). 4. The Add button and its associated event method are now obsolete, so in the Design View window delete the Add button. In the Code and Text Editor window, comment out the add_Click method. 5. In the newMember_Click method, comment out the following statement:
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The remaining menu item is the about menu item, which should display a dialog box providing information about the version of the application, the publisher, and any other useful information. You will add an event method to handle this event in the next exercise.
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Handle the menu item event
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1. On the Project menu, click Add Window. 2. In the Add New Item BellRingers dialog box, in the Templates pane, click Window (WPF). In the Name text box, type About.xaml, and then click Add. When you have added the appropriate controls, you will display this window when the user clicks the About Middleshire Bell Ringers command on the Help menu. Note Visual Studio provides the About Box windows template. However, this template generates a Windows Forms window rather than a WPF window. 3. In the Design View window, click the About.xaml form. In the Properties window, change the Title property to About Middleshire Bell Ringers, set the Width property to 300, and set the Height property to 156. Set the ResizeMode property to NoResize to prevent the user from changing the size of the window. 4. In the Name box at the top of the Properties window, type AboutBellRingers. 5. Add two label controls and a button control to the form. In the XAML pane, modify the properties of these three controls as shown here in bold type (feel free to change the text displayed by the buildDate label if you prefer):
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<Window x:Class= BellRingers.About xmlns= http://schemas.microsoft.com/winfx/2006/xaml/presentation xmlns:x= http://schemas.microsoft.com/winfx/2006/xaml Title= About Middleshire Bell Ringers Height= 156 Width= 300 Name= AboutBellRingers ResizeMode= NoResize > <Grid> <Label Margin= 80,20,0,0 Name= version Height= 30 VerticalAlignment= Top HorizontalAlignment= Left Width= 75 >Version 1.0</Label>
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<Label Margin= 80,50,0,0 Name= buildDate Height= 30 VerticalAlignment= Top HorizontalAlignment= Left Width= 160 >Build date: September 2007</Label> <Button Margin= 100,85,0,0 Name= ok HorizontalAlignment= Left Width= 78 Height= 23 VerticalAlignment= Top >OK</Button> </Grid> </Window>
The completed form should look like this:
6. In the Design View window, double-click the OK button. Visual Studio generates an event method for the Click event of the button and adds the ok_Click method to the About.xaml.cs le. 7. In the Code and Text Editor window displaying the About.xaml.cs le, add the statement shown in bold type to the ok_Click method:
private void ok_Click(object sender, RoutedEventArgs e) { this.Close(); }
When the user clicks the OK button, the window will close. 8. Return to the Design View window displaying the Window1.xaml le. In the XAML pane, locate the de nition of the about menu item and use the <New Event Handler> command to specify a Click event method called about_Click. (This is the default name generated by the <New Event Handler> command.) 9. In the Code and Text Editor window displaying the Window1.xaml.cs le, add the following statements shown in bold to the about_Click method:
private void about_Click(object sender, RoutedEventArgs e) { About aboutWindow = new About(); aboutWindow.ShowDialog(); }
This code creates a new instance of the About window and then calls the ShowDialog method to display it. The ShowDialog method does not return until the About window closes (when the user clicks the OK button).
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Working with Menus and Dialog Boxes
Test the menu events
1. On the Debug menu, click Start Without Debugging to build and run the application. Notice that all the elds on the form are disabled. 2. Click the File menu. The Save Member Details command is disabled. 3. On the File menu, click New Member. The elds on the form are now available. 4. Input some details for a new member. 5. Click the File menu again. The Save Member Details command is now available. 6. On the File menu, click Save Member Details. After a short delay, the message Member details saved appears. Click OK in this message box. 7. Using Windows Explorer, move to the \Microsoft Press\Visual CSharp Step by Step\ 23\BellRingers\BellRingers\bin\Debug folder under your Documents folder. You should see a le called Members.txt in this folder. 8. Double-click Members.txt to display its contents using Notepad. This le should contain the details of the new member. 9. Close Notepad, and return to the Middleshire Bell Ringers application. 10. On the Help menu, click About Middleshire Bell Ringers. The About window appears. Notice that you cannot resize this window, and you cannot click any items on the Members form while the About window is still visible. 11. Click OK to return to the Members form. 12. On the File menu, click Exit. The form tries to close. You are asked if you are sure you want to close the form. If you click No, the form remains open; if you click Yes, the form closes and the application nishes. 13. Click Yes to close the form.
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