barcode print in asp net USING A POP-UP MENU in .NET

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EXAMPLE 5.6 USING A POP-UP MENU
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Let us create a program that initially displays a gray-colored form containing a circle with a gray center (i.e., without any distinctive fill color). The program will include a pull-down menu allowing the user to change the circle s fill color to red, green or blue, and to clear the fill color (thus restoring the original gray color). The program will include two objects: a shape (the circle), and a command button, used to end the computation. The initial form is shown in Fig. 5.17.
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Fig. 5.17
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In order to achieve this appearance, the objects have been assigned the following properties:
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MENUS AND DIALOG BOXES
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Object Form1 Command1 Shape
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Property Caption Caption Font Shape BorderWidth FillStyle FillColor
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Value Colors Quit MS Sans Serif, 10-point 3 Circle 2 0 Solid Gray
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Fig. 5.18 shows the Menu Editor, with the entries required to change the color within the circle. Notice the caption (Colors) and the name (mnuColor) assigned to the first menu item. Also, note the use of separators between the menu items.
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Fig. 5.18
In order to display the menu and bring about the desired color changes in response to the menu selections, we must add the following event procedures via the Code Editor Window.
Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single) If Button = vbRightButton Then PopupMenu mnuColor End If End Sub Private Sub RedColor_Click() Shape1.FillColor = vbRed End Sub Private Sub GreenColor_Click() Shape1.FillColor = vbGreen End Sub Private Sub BlueColor_Click() Shape1.FillColor = vbBlue End Sub
(Continues on next page)
MENUS AND DIALOG BOXES
[CHAP. 5
Private Sub ClearColor_Click() Shape1.FillColor = vbMenuBar End Sub Private Sub Command1_Click() End End Sub
'Gray
We have already explained that the first of these event procedures causes the pop-up menu to appear in response to clicking the right mouse button. All of the components in this event procedure are reserved words with a predefined meaning, except for mnuColor, which is the name of the first menu item (see Fig. 5.18). The next four event procedures (RedColor, GreenColor, Blue Color, and ClearColor) assign the desired fill colors to the circle (Shape1.FillColor). Within these event procedures, the identifiers vbRed, vbGreen, vbBlue and vbMenuBar are predefined Visual Basic constants that represent the colors red, green, blue and medium gray, respectively. When the program is executed, the form originally appears as shown in Fig. 5.19.
Fig. 5.19
Clicking the right mouse button then causes the pop-up menu to appear, as in Fig. 5.20.
Fig. 5.20
CHAP. 5]
MENUS AND DIALOG BOXES
Selecting one of the menu items then alters the fill color of the circle, as shown in Fig. 5.21. Note that the original gray color can be restored by selecting Clear.
Fig. 5.21
5.6 DIALOG BOXES A dialog box is used to exchange information between the program and the user. It is a separate form that is generally accessed in response to a selection from a menu or a list. Dialog boxes typically contain common controls (e.g., labels, text boxes, option buttons, check boxes, and command buttons) to enter or display information. In addition, the dialog box features must be accessible from other forms (i.e., from primary or parent forms), and the information entered into the dialog box by the user must be recognizable within these forms. A secondary form (e.g., a dialog box) can be added to an active project via the Load command; i.e.,
Load form
For example, the command
Load Form2
will cause the form named Form2 to be loaded into the currently active project. Similarly, a form can be removed from an active project, thus freeing up memory, via the Unload command; i.e.,
Unload form
For example,
Unload Form2
Thus, the form named Form2 will be unloaded (removed) from the currently active project. As a result, references to the object named Form2 will no longer be recognized within the currently active project. Loading a form into an active project does not in itself cause the form to be visible. To make the form visible, we use the Show method; i.e.,
form.Show
(Recall that a method is similar to a property. Whereas properties represent values associated with objects, however, methods carry out actions on objects.) For example,
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