create barcode generator c# Working with Controls in Visual C#

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Working with Controls
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Microsoft Visual Basic .NET Step by Step
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Notice that I wrapped the long line that loads the image into the picture box object by using the line continuation (_) character. 9
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View Designer button
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Click the View Designer button in Solution Explorer to display the form again, and then double-click the second check box and add the following code to the CheckBox2_CheckedChanged event procedure:
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If CheckBox2.CheckState = 1 Then PictureBox2.Image = System.Drawing.Image.FromFile _ ( c:\vbnetsbs\chap03\copymach.bmp ) PictureBox2.Visible = True Else PictureBox2.Visible = False End If
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The complete CheckBox program is located in the c:\vbnetsbs\ chap03\checkbox folder.
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This event procedure is almost identical to the one that you just entered; only the names of the image (copymach.bmp), the check box object (CheckBox2), and the picture box object (PictureBox2) are different. 10 Click the Save All button on the Standard toolbar to save your changes.
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Run the CheckBox program
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1 Click the Start button on the Standard toolbar. Visual Basic runs the program in the development environment. Because you placed a check mark in the first check box, the calculator image appears on the form. 2 Click the Copy machine check box. Visual Basic displays the copy machine image, as shown here:
Start button
Experiment with different combinations of check boxes, clicking the boxes several times to test the program. The program logic you added with a few
3 Working with Toolbox Controls
short lines of Visual Basic code manages the boxes perfectly. (You ll learn much more about program code in upcoming chapters.) 4 Click the Close button on the form to end the program.
The Input Controls Demo
Now that you ve had a little experience with check boxes, run and examine the Input Controls demonstration program that I created to simulate an electronic ordering environment that makes more extensive use of check boxes, radio buttons, a list box, and a combo box. If you work in a business that does a lot of order entry, you might want to expand this into a full-featured graphical order entry program. After you experiment with Input Controls, spend some time learning how the four input controls work in the program. They were created in a few short steps by using Visual Basic and the techniques you just learned.
Run the Input Controls program
1 2 On the File menu, point to Open, and then click Project. The Open Project dialog box appears. Open the c:\vbnetsbs\chap03\input controls folder, and then double-click the Input Controls project file (Input Controls.vbproj). The Input Controls project opens in the development environment. If the project s form isn t visible, click the Form1.vb form in Solution Explorer and then click the View Designer button. Move or close the windows that block your view of the form so that you can see how the objects are laid out. You ll see a form similar to this:
View Designer button
Working with Controls
Microsoft Visual Basic .NET Step by Step
The Input Controls form contains radio button, check box, list box, combo box, picture box, button, and label objects. These objects work together to create a simple order entry program that demonstrates how the Visual Basic input objects work. When the Input Controls program is run, it loads images from the \vbnetsbs\chap03\input controls folder on drive C and displays them in the six picture boxes on the form.
If you installed the practice files in a location other than the default c:\vbnetsbs folder, the statements in the program that load the artwork from the disk will contain an incorrect path. (Each statement begins with c:\vbnetsbs\chap03\input controls, as you ll see soon.) If this is the case, you can make the program work by renaming your practice files folder \vbnetsbs or by changing the paths in the Code Editor using the editing keys or the Find And Replace submenu on the Edit menu.
Start button
Click the Start button on the Standard toolbar. The program runs in the development environment. Click the Laptop radio button in the Computer box. The image of a laptop computer appears in the Products Ordered area on the right side of the form. The user can click various options and the current choice is depicted in the order area on the right. In the Computer box, a group of radio buttons is used to gather input from the user. (Note: Radio buttons were called option buttons in Visual Basic 6.) Radio buttons force the user to choose one (and only one) item from a list of possibilities. When radio buttons are placed inside a group box object on a form, the radio buttons are considered to be part of a group and only one option can be chosen. To create a group box, click the GroupBox control on the Windows Forms tab of the Toolbox, and then draw the control on your form. (The GroupBox control replaces the Frame control in Visual Basic 6.) You can give the group of radio buttons a title (as I have) by setting the Text property of the group box object. When you move a group box object on the form, the controls within it also move.
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