c# generate barcode image Edit the Close command event procedure in Visual C#.NET

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Edit the Close command event procedure
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1 Display the form again, and then double-click the Close command on the File menu. The event procedure for the Close command appears in the Code Editor. 2
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Use the Nothing keyword to clear the Image property of the picture box object.
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Type the following program statements in the event procedure, between the Private Sub and End Sub statements.
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PictureBox1.Image = Nothing mnuCloseItem.Enabled = False
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Menus and Dialog Boxes
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The Filter property defines the file types that will be listed in the Open dialog box.
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To add additional items to the Filter list, you can type a pipe symbol (|) between items. For example,
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OpenFileDialog1.Filter = Bitmaps (*.bmp)|*.bmp|Metafiles (*.wmf)|*.wmf
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The first statement closes the open Windows bitmap by clearing the picture box object s Image property. The Nothing keyword is used here to disassociate the current bitmap object from the Image property in other words, Nothing sets the property to zero, and the picture disappears. (You ll use Nothing later in this book to reset other object variables and properties too.) The second statement dims the Close command on the File menu because there is no longer an open file. This program statement is the equivalent to using the Properties window to change the Enabled property from True to False.
Now you ll type in the program code for the mnuExitItem_Click event procedure, the routine that stops the program when the Exit command on the File menu is clicked.
Edit the Exit command event procedure
1 Display the form again, and then double-click the Exit command on the File menu. The event procedure for the Exit command appears in the Code Editor. 2 Type the following program statement in the event procedure, between the Private Sub and End Sub statements:
The End statement stops the program when the user is finished. (It might look familiar by now.)
Edit the Text Color command event procedure
1 Display the form again, and then double-click the new Text Color command on the Clock menu. The event procedure for the Text Color command appears in the Code Editor. 2 Type the following program statements in the event procedure:
ColorDialog1.ShowDialog() Label1.ForeColor = ColorDialog1.Color
The Color dialog box can be used to set the color of any user interface element that supports color. Other possibilities include the form background color, the colors of shapes on the form, and the foreground and background colors of objects.
4 Working with Menus and Dialog Boxes
Save All button
Click the Save All button on the Standard toolbar to save your changes.
Controlling Color Choices by Setting Color Dialog Box Properties
If you want to further customize the color dialog box, you can control just what color choices the dialog box presents to the user when the dialog box opens. You can adjust these color settings by using the Properties window, or by setting properties using program code before you display the dialog box with the ShowDialog method. The following table describes the most useful properties of the ColorDialog control. Each property should be set with a value of True to enable the option, or False to disable the option.
Property AllowFullOpen AnyColor FullOpen ShowHelp SolidColorOnly Meaning Set to True to enable the Define Custom Colors button in the dialog box. Set to True if the user can select any color shown in the dialog box. Set to True if you want to display the Custom Colors area when the dialog box first opens. Set to True if you want to enable the Help button in the dialog box. Set to True if you only want the user to select solid colors (dithered colors will be disabled).
Now you ll run the Menu program and experiment with the menus and dialog boxes you ve created.
Menus and Dialog Boxes
The first program statement uses the ShowDialog method to open the color dialog box. As you learned earlier in this chapter, ShowDialog is the method you use to open any form as a dialog box, including a form created by one of the standard dialog box controls that Visual Studio provides. The second statement in the event procedure assigns color that the user selected in the dialog box to the ForeColor property of the Label1 object. You might remember Label1 from earlier in this chapter it s the label box you used to display the current time and date on the form. You ll use the color returned from the color dialog box to set the color of the text in the label.
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