Introduction

To start, the square box may be empty . If the user clicks it, a check mark appears in the square box . If the user clicks a check box that has a check mark in it, the check mark may be removed.

To let the user know what the check box control represents, the control is accompanied by a label that displays the statement. When the square box is empty *, the statement is false. When the square box is filled with a check mark T, the statement is true.

To support check boxes, the .NET Framework provides the CheckBox class. To add a check box to your application at design time, from the Common Controls section of the Toolbox, yon can click the CheckBox control and click the form or a container on the form. Unlike the radio button but like the regular command button, a check box can safely be positioned directly on a form.

To programmatically create a check box, declare a variable of type CheckBox, use the new operator to allocate memory for it, and add it to the Controls collection of its holder. Here is an example:

using System;
using System.Drawing;
using System.Windows.Forms;

public class Exercise : System.Windows.Forms.Form
{
    CheckBox chkValidate;

    public Exercise()
    {
        InitializeComponent();
    }

    private void InitializeComponent()
    {
        chkValidate = new CheckBox();

        Controls.Add(chkValidate);
    }
}

public class Program
{
    static int Main()
    {
        System.Windows.Forms.Application.Run(new Exercise());
        return 0;
    }
}

Unlike the radio button that usually comes along with other radio buttons, a check box can appear by itself. Even when it comes in a group with others, the behavior of one check box is independent of the other check boxes, even if they belong to the same group.

1. Start a new Windows Application named DaniloPizza1
2. In the Solution Explorer, right-click Form1.cs and click Rename
3. Type Exercise.cs and press Enter
4. On the main menu, click Project -> Add New Item...
5. In the Templates list, click Icon File
6. Set the Name to pizza and click Add
7. Using the Erase tool , wipe its interior to erase its content
8. Use the Ellipse tool and the black color to draw an oval shape
    
   
9. Fill it up with a brown color (the color on the right side of the black)
10. Click the red color
11. Click the Airbrush tool
12. Click the option button and select the Medium brush
     
    
13. Randomly click different parts of the shape
     
    
14. To give the appearance of a crust, use the Pencil tool , click the black color, right-click the brown color, and draw a dark border around the shape
15. With still the black and the brown colors, randomly click and right-click different points in the shape:
     
    
16. Click the white color. Right-click the yellow color. Randomly click and right-click a few times in the shape
17. Click the brown color again and click the Line tool
18. Randomly draw horizontal, vertical, and dialog lines in the shape
     
    
19. Right-click a white section in the drawing area, position the mouse on Current Icon Image Types, and click 16x16, 16 Colors
20. Design it as follows:
     
    
21. Save the icon and close it
22. Use the Icon field of the form in the Properties window to assign the pizza.ico icon to the form
23. Design the form as follows:
     

    Control Text Name Additional Properties GroupBox Pizza Size     RadioButton Small rdoSmall   TextBox 8.95 txtSmall AlignText: Right RadioButton Medium rdoMedium Checked: True TextBox 10.75 txtMedium AlignText: Right RadioButton Large rdoLarge   TextBox 12.95 txtLarge AlignText: Right GroupBox Side Orders     Label Qty     Label Unit Price     Label Sub Total     Label Bread Sticks     TextBox 0 txtQtyBread AlignText: Right TextBox 3.25 txtPriceBread AlignText: Right TextBox 0.00 txtTotalBread AlignText: Right ReadOnly: True Label Buffalo Wings     TextBox 0 txtQtyWings AlignText: Right TextBox 2.15 txtPriceWings AlignText: Right TextBox 0.00 txtTotalWings AlignText: Right ReadOnly: True GroupBox Toppings     CheckBox Pepperoni chkPepperoni   CheckBox Sausage chkSausage   CheckBox Extra Cheese chkExtraCheese   CheckBox Olives chkOlives   CheckBox Onions chkOnions   Label Each Topping     TextBox 0.45 txtEachTopping AlignText: Right GroupBox Drinks     Label Qty     Label Unit Price     Label Sub Total     Label Soda Can     TextBox 0 txtQtyCan AlignText: Right TextBox 1.45 txtPriceCan AlignText: Right TextBox 0.00 txtTotalCan AlignText: Right ReadOnly: True Label Soda 20 Oz.     TextBox 0 txtQtySoda20 AlignText: Right TextBox 1.45 txtPriceSoda20 AlignText: Right TextBox 0.00 txtTotalSoda20 AlignText: Right ReadOnly: True Label Soda 2L Bottle     TextBox 0 txtQtySoda2L AlignText: Right TextBox 1.45 txtPriceSoda2L AlignText: Right TextBox 0.00 txtTotalSoda2L AlignText: Right ReadOnly: True Label Orange Juice     TextBox 0 txtQtyOJ AlignText: Right TextBox 2.25 txtPriceOJ AlignText: Right TextBox 0.00 txtTotalOJ AlignText: Right ReadOnly: True Label Water     TextBox 0 txtQtyWater AlignText: Right TextBox 1.25 txtPriceWater AlignText: Right TextBox 0.00 txtTotalWater AlignText: Right ReadOnly: True Button Close btnClose   Label Total Price     TextBox 0.00 txtTotalPrice AlignRight: Right ReadOnly: True

24. Save everything