Microsoft Visual C++/CLI - Windows Controls: The Check Box

	Windows Controls: Check Boxes

Overview of Check Boxes

Description

A check box is a control that makes a statement true or false. To perform this validation, the control displays a small square box that the user can click. Here are examples:

The Options dialog box of Microsoft FrontPage

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.

Practical Learning: Introducing Check Boxes

Start Microsoft Visual Studio
To create a new application, on the main menu, click File -> New Project
In the middle list, click Windows Forms Application
Change the Name to DaniloPizza1
Click OK
On the main menu, click View -> Other Windows -> Resource View.
In the Resource View, expand everything. Right-click Icon -> Insert Icon
Using the Erase tool , wipe its interior to erase its content
Use the Ellipse tool and the black color to draw an oval shape
Fill it up with a brown color (the color on the right side of the black)
Click the red color
Click the Airbrush tool
Click the option button and select the Medium brush
Randomly click different parts of the shape
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
With still the black and the brown colors, randomly click and right-click different points in the shape:
Click the white color. Right-click the yellow color. Randomly click and right-click a few times in the shape
Click the brown color again and click the Line tool
Randomly draw horizontal, vertical, and dialog lines in the shape
Right-click a white section in the drawing area, position the mouse on Current Icon Image Types, and click 16x16, 16 Colors
Design it as follows:
Save the icon and close it
Use the Icon field of the form in the Properties window to assign the pizza.ico icon to the form

Creating a Check Box

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:

#include <windows.h>

#using <System.dll>
#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>

using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;

public ref class CExercise : public Form
{
private:
    CheckBox ^ chkValidate;

public:
    CExercise()
    {
	InitializeComponent();
    }

private:
    void InitializeComponent()
    {
        chkValidate = gcnew CheckBox;

        Controls->Add(chkValidate);
    }
};

[STAThread]
int APIENTRY WinMain(HINSTANCE hInstance,
		     HINSTANCE hPrevInstance,
		     LPSTR lpCmdLine,
		     int nCmdShow)
{
    Application::Run(gcnew CExercise);

    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.

Practical Learning: Adding Check Boxes

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

Save everything

Check Box Characteristics

Checking a Check Box

By default, a check box appears empty, which makes its statement false. To make the statement true, the user can click it. There are three main ways you can use this property of a check box. To select a check box, you can set its Checked property to True. You can also do it programmatically as follows:

void InitializeComponent()
{
    chkValidate = gcnew CheckBox;

    Controls->Add(chkValidate);

    chkValidate->Checked = true;
}

To find out if an item is selected, get the value of its Checked property. Another possibility consists of toggling the state of the check mark. For example, you can check or uncheck the check mark when the user clicks another button. To do this, you can simply negate the truthfulness of the control as follows:

chkValidate->Checked = !chkValidate->Checked;

Like the radio button, when a check box is clicked, the control fires a CheckedChanged event to let you know that it has been checked. This event is of type EventArgs. If the check box can display only two states, checked or unchecked, this event is enough.

Topic Applied: Configuring Check Boxes

On the form, click the Small radio button
Press and hold Shift
Click the Medium radio button, the Large radio button, the Pepperoni, the Sausage, the Extra Cheese, the Olives, and the Onions check boxes
Release Shift
In the Properties window, click the Events button
In the Events section, double-click Click
Return to the form
Click the txtSmall text box
Press and hold Shift
Click each of the following controls: txtMedium, txtLarge, txtEachTopping, txtQtyBread, txtPriceBread, txtQtyWings, txtPriceWince, txtQtyCan, txtPriceCan, txtQtySoda20, txtPriceSoda20, txtQtySoda2L, txtPriceSoda2L, txtQtyOJ, txtPriceOJ, txtQtyWater, and txtPriceWater
Release Shift
In the Events section of the Properties window, double-click Leave

In the Code Editor, define a member function named CalculatePrice() and implement the events as follows:

void CalculatePrice()
{
    double PriceSize = 0.00;
    double PriceEachTopping = 0.00, BWings, Bread,
	   SodaCan, Soda20, Soda2L, OJ, Water, PriceToppings, TotalOrder;
    int Pepperoni, Sausage, ExtraCheese, Onions, Olives;
	
    try {
        // Get the price of pizza depending on the selected size
        if( rdoSmall->Checked == true)
			PriceSize = double::Parse(txtSmall->Text);
        if( rdoMedium->Checked == true)
			PriceSize = double::Parse(txtMedium->Text);
        if( rdoLarge->Checked == true)
			PriceSize = double::Parse(txtLarge->Text);
    }
    catch(FormatException ^)
    {
    MessageBox::Show("The value you typed for the price of a pizza is invalid"
	                 "\nPlease try again", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }

    // Get the price of a topping if it was selected
    if( chkPepperoni->Checked == true)
	Pepperoni = 1;
    else
	Pepperoni = 0;
	
    if( chkSausage->Checked == true)
	Sausage = 1;
    else
	Sausage = 0;
	
    if( chkExtraCheese->Checked == true)
	ExtraCheese = 1;
    else
	ExtraCheese = 0;
	
    if( chkOnions->Checked == true)
	Onions = 1;
    else
	Onions = 0;
	
    if( chkOlives->Checked == true)
	Olives = 1;
    else
	Olives = 0;

    // Get the price of each topping
    try {
	PriceEachTopping = double::Parse(txtEachTopping->Text);
    }
    catch(FormatException ^)
    {
	MessageBox::Show("The value you typed for the price of a each topping is invalid"
                         "\nPlease try again", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }
	
    PriceToppings = (Pepperoni + Sausage + ExtraCheese + Onions + Olives) * PriceEachTopping;
	
    // Calculate the price of the side dishes
    // depending on the quantity entered
    BWings = double::Parse(txtTotalWings->Text);
    Bread = double::Parse(txtTotalBread->Text);
	
    // Calculate the price of the drink(s)
    SodaCan = double::Parse(txtTotalCan->Text);
    Soda20 = double::Parse(txtTotalSoda20->Text);
    Soda2L = double::Parse(txtTotalSoda2L->Text);
    OJ = double::Parse(txtTotalOJ->Text);
    Water = double::Parse(txtTotalWater->Text);
	
    TotalOrder = PriceSize + PriceToppings + BWings + Bread +
	         SodaCan + Soda20 + Soda2L + OJ + Water;
    txtTotalOrder->Text = TotalOrder.ToString("F");
}

System::Void rdoSmall_Click(System::Object^  sender, System::EventArgs^  e)
{
    CalculatePrice();
}

System::Void txtSmall_Leave(System::Object^  sender, System::EventArgs^  e)
{
    int QtyBread = 0, QtyWings = 0, QtyCan = 0,
    QtySoda20 = 0, QtySoda2L = 0, QtyOJ = 0, QtyWater = 0;
    double PriceBread = 0.00, TotalBread = 0.00,
           PriceWings = 0.00, TotalWings = 0.00,
           PriceCan = 0.00, TotalCan = 0.00,
           PriceSoda20 = 0.00, TotalSoda20 = 0.00,
           PriceSoda2L = 0.00, TotalSoda2L = 0.00,
           PriceOJ = 0.00, TotalOJ = 0.00,
           PriceWater = 0.00, TotalWater = 0.00;

    // Retrieve the quantity set in the text box
    try {
	QtyBread = int::Parse(txtQtyBread->Text);
    }
    catch(FormatException ^)
    {
	MessageBox::Show("The value you entered for the quantify of bread sticks is not valid"
                         "\nPlease try again!", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }
	
    // Get the unit price of the item
    try {
	PriceBread = double::Parse(txtPriceBread->Text);
    }
    catch(FormatException ^)
    {
	MessageBox::Show("The value you entered for the price of bread sticks is not valid"
                         "\nPlease try again!", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }
	
    // Calculate the sub-total of this item
    TotalBread = QtyBread * PriceBread;
    // Display the sub-total in the corresponding text box
    txtTotalBread->Text = TotalBread.ToString("F");
	
    try {
	PriceWings = int::Parse(txtQtyWings->Text);
    }
    catch(FormatException ^)
    {
	MessageBox::Show("The value you entered for the quantify of orders of buffalo wings is not valid"
                         "\nPlease try again!", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }
    
    try {
	PriceWings = double::Parse(txtPriceWings->Text);
    }
    catch(FormatException ^)
    {
	MessageBox::Show("The value you entered for the price of buffalo wings is not valid"
                         "\nPlease try again!", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }
	
    TotalWings = QtyWings * PriceWings;
    txtTotalWings->Text = TotalWings.ToString("F");
	
    try {
	QtyCan = int::Parse(txtQtyCan->Text);
    }
    catch(FormatException ^)
    {
	MessageBox::Show("The value you entered for the quantify of soda cans is not valid"
                         "\nPlease try again!", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }
    
    try {
	PriceCan = double::Parse(txtPriceCan->Text);
    }
    catch(FormatException ^)
    {
	MessageBox::Show("The value you entered for the price of soda cans is not valid"
                         "\nPlease try again!", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }
	
    TotalCan = QtyCan * PriceCan;
    txtTotalCan->Text = TotalCan.ToString("F");
	
    try {
	QtySoda20 = int::Parse(txtQtySoda20->Text);
    }
    catch(FormatException ^)
    {
	MessageBox::Show("The value you entered for the quantify of soda 20 Oz. is not valid"
                         "\nPlease try again!", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }
            
    try {
	PriceSoda20 = double::Parse(txtPriceSoda20->Text);
    }
    catch(FormatException ^)
    {
	MessageBox::Show("The value you entered for the price of soda 20 Oz. is not valid"
                         "\nPlease try again!", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }

    TotalSoda20 = QtySoda20 * PriceSoda20;
    txtTotalSoda20->Text = TotalSoda20.ToString("F");
    
    try {
	QtySoda2L = int::Parse(txtQtySoda2L->Text);
    }
    catch(FormatException ^)
    {
	MessageBox::Show("The value you entered for the quantify of bottles of soda 2-litter is not valid"
                         "\nPlease try again!", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }

    try {
	PriceSoda2L = double::Parse(txtPriceSoda2L->Text);
    }
    catch(FormatException ^)
    {
	MessageBox::Show("The value you entered for the price of a bottle of soda is not valid"
                         "\nPlease try again!", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }
	
    TotalSoda2L = QtySoda2L * PriceSoda2L;
    txtTotalSoda2L->Text = TotalSoda2L.ToString("F");
	
    try {
	QtyOJ = int::Parse(txtQtyOJ->Text);
    }
    catch(FormatException ^)
    {
	MessageBox::Show("The value you entered for the quantify of a bottle of orange juice is not valid"
                         "\nPlease try again!", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }
	
    try {
	PriceOJ = double::Parse(txtPriceOJ->Text);
    }
    catch(FormatException ^)
    {
	MessageBox::Show("The value you entered for the price of bottles of orange is not valid"
                         "\nPlease try again!", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }
	
    TotalOJ = QtyOJ * PriceOJ;
    txtTotalOJ->Text = TotalOJ.ToString("F");
	
    try {
	QtyWater = int::Parse(txtQtyWater->Text);
    }
    catch(FormatException ^)
    {
	MessageBox::Show("The value you entered for the quantify of bottles of water is not valid"
                         "\nPlease try again!", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }
     
    try {
	PriceWater = double::Parse(txtPriceWater->Text);
    }
    catch(FormatException ^)
    {
	MessageBox::Show("The value you entered for the price of bottle of water is not valid"
                         "\nPlease try again!", "Danilo Pizza",
                         MessageBoxButtons::OK, MessageBoxIcon::Information);
    }
	
    TotalWater = QtyWater * PriceWater;
    txtTotalWater->Text = TotalWater.ToString("F");
	
    CalculatePrice();
}

Return to the and double-click the Close button

Implement its Click event as follows:

System::Void btnClose_Click(Object ^ sender, System.EventArgs ^ e)
{
	Close();
}

Execute the application and test the form. Here is an example:
Close the form and return to your programming environment

The Alignment of a Check Box

By default, the square box of a check control is positioned to the left side of its accompanying label. Instead of this default left position, you can change as you wish. The position of the round box with regards to its label is controlled by the CheckAlign property that of type ContentAlignment. To programmatically set the check alignment of a check box, you can call the ContentAlignment enumeration and select the desired value. Here is an example:

void InitializeComponent()
{
    chkValidate = gcnew CheckBox;

    Controls->Add(chkValidate);
    chkValidate->Checked = true;
    
    chkValidate->CheckAlign = ContentAlignment::MiddleRight;
}

The Checked State of a Check Box

Instead of being definitely checked, you can let the user know that the decision of making the statement true or false is not complete. This means that a check box can display as "half-checked". In this case the check mark would appear as if it were disabled. This behavior is controlled through the CheckState property. To provide this functionality, assign the Indeterminate value to its CheckState property. You can do this programmatically as follows:

chkValidate->CheckState = CheckState::Indeterminate;

Indeterminate check box

The CheckState property only allows setting the check box control as "undecided". If you actually want the user to control three states of the control as checked, half-checked, or unchecked, use the ThreeState property.

By setting the CheckState Boolean property to true, the user can click it two to three times to get the desired value. When this ability is given to the user, you can use or check the value of the Indeterminate property to find out whether the control is checked, half-checked, or unchecked.

Here is an example of specifying the check box control as being able to display one of three states:

void InitializeComponent()
{
    chkValidate = gcnew CheckBox;

    Controls->Add(chkValidate);
    chkValidate->Checked = true;

    chkValidate->ThreeState = true;
}

If a check box is configured to assume one of three states when it's clicked, that is, if the ThreeState property of a check button is set to True, when the user clicks such a button, the button acquires one of the available three states, which are Checked, Unchecked, or Indeterminate. This causes the control to fire a CheckStateChanged event. This event also is of type EventArgs. This means that it does not let you know the current state of the button. You would have to find it out yourself, which is easily done by getting the value of the CheckState property.

The Appearance of a Check Box

By default, a check box appears as a square box that gets a check mark when the user clicks it. Optionally, you can make a check box appear as a toggle button. In that case, the button would appear as a regular button. When the user clicks it, it appears down. If the user clicks it again, it becomes up.

To change the appearance of a check box, assign the Button or Normal value to its Appearance property. The Appearance values are defined in the Appearance enumeration. You can also do this programmatically as follows:

void InitializeComponent()
{
    chkValidate = gcnew CheckBox;

    Controls->Add(chkValidate);
    chkValidate->Checked = true;
    chkValidate->ThreeState = true;

    chkValidate->Appearance = Appearance::Button;
}

Like the radio button, the check box control fires an AppearanceChanged event when the button's appearance changes from Normal to Button or vice-versa.

Practical Learning: Using the Appearance of a Check Box

To start a new application, on the main menu, click File -> New Project...
In the middle list, click Windows Application and set the name to Logic1
Click OK

Design the form as follows:

Control	Text	Name	Font	FlatStyle	Appearance
Label	A		Microsoft Sans Serif, 24pt
Label	B		Microsoft Sans Serif, 24pt
Label	A ^ B	lblOperation	Microsoft Sans Serif, 24pt
CheckBox	False	chkOperand1	Microsoft Sans Serif, 18pt	System	Button
CheckBox	False	chkOperand2	Microsoft Sans Serif, 18pt	System	Button
CheckBox	False	chkResult	Microsoft Sans Serif, 18pt	System	Button
Button	New Operation	btnNewOperation	Microsoft Sans Serif, 15.75pt
Button	Check	btnCheckOperation	Microsoft Sans Serif, 18pt
Button	Close	btnClose	Microsoft Sans Serif, 15.75pt

Double-click the top-left check box and implement its event as follows:

System::Void chkOperand1_CheckedChanged(Object ^ sender, EventArgs ^ e)
{
        if( chkOperand1->Checked == true)
                chkOperand1->Text = "True";
        else
                chkOperand1->Text = "False";
}

Return to the form

Double-click the top-center check box and implement its event as follows:

System::Void chkOperand2_CheckedChanged(Object ^ sender, EventArgs ^ e)
{
        if( chkOperand2->Checked == true)
                chkOperand2->Text = "True";
        else
                chkOperand2->Text = "False";
}

Return to the form

Double-click the top-right check box and implement its event as follows:

System::Void chkResult_CheckedChanged(Object ^ sender, EventArgs ^ e)
{
        if( chkResult->Checked == true)
                chkResult->Text = "True";
        else
                chkResult->Text = "False";
}

Return to the form

Double-click the New Operation button and implement its event as follows:

System::Void btnNewOperation_Click(Object ^ sender, EventArgs ^ e)
{
        array<String ^> ^  strBooleanValues = { "True", "False" };
        array<String ^> ^  strOperations = { "A ^ B", "A V B" };
        Random ^ rnd = new Random();

        chkOperand1->Text = strBooleanValues[rnd.Next(2)];
        chkOperand2->Text = strBooleanValues[rnd.Next(2)];

        if( chkOperand1->Text == "True")
                chkOperand1->Checked = true;
        else
                chkOperand1->Checked = false;

        if( chkOperand2->Text == "True")
                chkOperand2->Checked = true;
        else
                chkOperand2->Checked = false;

        lblOperation->Text = strOperations[rnd.Next(2)];
}

Return to the form

Double-click the Check button and implement its event as follows:

System::Void btnCheckResult_Click(Object ^ sender, EventArgs ^ e)
{
        // Logical Conjunction
        if( lblOperation->Text == "A ^ B")
        {
                // If A = true
                if( chkOperand1->Checked == true)
                {
                    if( chkOperand2->Checked == true)
                    {
                        if( chkResult->Checked == true)
                        {
                            // | A | B | A ^ B |
                            // | T | T |   T   |
                            MessageBox::Show("Bravo - Good Answer");
                        }
                        else  if( chkResult->Checked == false)
                        {
                            // | A | B | A ^ B |
                            // | T | T |   F   |
                            MessageBox::Show("Wrong - Get it right next time!");
                        }
                    }
                    else if( chkOperand2->Checked == false)
                    {
                        if( chkResult->Checked == false)
                        {
                            // | A | B | A ^ B |
                            // | T | F |   F   |
                            MessageBox::Show("Bravo - Good Answer");
                        }
                        else  if( chkResult->Checked == true)
                        {
                            // | A | B | A ^ B |
                            // | T | F |   T   |
                            MessageBox::Show("Wrong - Get it right next time!");
                        }
                    }
                }
                else  if( chkOperand1->Checked == false )
                {
                    if( chkOperand2->Checked == true)
                    {
                        if( chkResult->Checked == false)
                        {
                            // | A | B | A ^ B |
                            // | F | T |   F   |
                            MessageBox::Show("Bravo - Good Answer");
                        }
                        else  if( chkResult->Checked == true )
                        {
                            // | A | B | A ^ B |
                            // | F | T |   T   |
                            MessageBox::Show("Wrong - Get it right next time!");
                        }
                    }
                    else  if( chkOperand2->Checked == false)
                    {
                        if( chkResult->Checked == false)
                        {
                            // | A | B | A ^ B |
                            // | F | F |   F   |
                            MessageBox::Show("Bravo - Good Answer");
                        }
                        else  if( chkResult->Checked == true)
                        {
                            // | A | B | A ^ B |
                            // | F | F |   T   |
                            MessageBox::Show("Wrong - Get it right next time!");
                        }
                    }
                }
            }
            else if( lblOperation->Text == "A V B") // Logical Disjunction:
            {
                // If A = true
                if( chkOperand1->Checked == true)
                {
                    if( chkOperand2->Checked == true)
                    {
                        if( chkResult->Checked == true)
                        {
                            // | A | B | A V B |
                            // | T | T |   T   |
                            MessageBox::Show("Bravo - Good Answer");
                        }
                        else if( chkResult->Checked == false)
                        {
                            // | A | B | A V B |
                            // | T | T |   F   |
                            MessageBox::Show("Wrong - Get it right next time!");
                        }
                    }
                    else if( chkOperand2->Checked == false)
                    {
                        if( chkResult->Checked == true)
                        {
                            // | A | B | A V B |
                            // | T | F |   T   |
                            MessageBox::Show("Bravo - Good Answer");
                        }
                        else if( chkResult->Checked == false)
                        {
                            // | A | B | A V B |
                            // | T | F |   F   |
                            MessageBox::Show("Wrong - Get it right next time!");
                        }
                    }
                }
                else if( chkOperand1->Checked == false)
                {
                    if( chkOperand2->Checked == true)
                    {
                        if( chkResult->Checked == true)
                        {
                            // | A | B | A V B |
                            // | F | T |   T   |
                            MessageBox::Show("Bravo - Good Answer");
                        }
                        else if( chkResult->Checked == false)
                        {
                            // | A | B | A V B |
                            // | F | T |   F   |
                            MessageBox::Show("Wrong - Get it right next time!");
                        }
                    }
                    else if( chkOperand2->Checked == false)
                    {
                        if( chkResult->Checked == false)
                        {
                            // | A | B | A V B |
                            // | F | F |   F   |
                            MessageBox::Show("Bravo - Good Answer");
                        }
                        else if( chkResult->Checked == true)
                        {
                            // | A | B | A V B |
                            // | F | F |   T   |
                            MessageBox::Show("Wrong - Get it right next time!");
                        }
                    }
                }
        }
}

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Double-click the Close button and implement its event as follows:

System::Void btnClose_Click(Object ^ sender, EventArgs ^ e)
{
        Close();
}

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