How To Develop Match Making Game Using C# in .Net 4.5

public partial class Form1 : Form
{
    Random random = new Random();
    List<string> icons = new List<string>()
    {
        "!", "!", "N", "N", ",", ",", "K", "K",
        "b", "b", "v", "v", "w", "w", "z", "z"
    };
}

private void AssignIconsToSquares()
{
    foreach(Control control in tableLayoutPanel1.Controls)
    {
        Label iconlabel = control as Label;
        if (iconlabel != null)
        {
            int randomNumber = random.Next(icons.Count);
            iconlabel.Text = icons[randomNumber];
            icons.RemoveAt(randomNumber);
        }
    }
}

public Form1()
{
    InitializeComponent();
    AssignIconsToSquares();
}

iconlabel.ForeColor = iconlabel.BackColor;

Step 8. Now you must add the click event for each label. For that you must first click on the first label, then hold the CTRL button and click on each label. In this way, all the Labels will be selected.

Now right-click on the page and in the properties window go to the Click event and type label_Click.

Press Enter and you will see that a click event handler is added to the code.

Step 9. Write the following code in the label_Click Event Handler.

private void label_Click(object sender, EventArgs e)
{
    Label clickedLabel = sender as Label;
    if (clickedLabel != null)
    {
        if (clickedLabel.ForeColor == Color.Black)
            return;
        clickedLabel.ForeColor = Color.Black;
    }
}

Now run your program, you should see a Blank form. Now click on a label and continue clicking until none of the labels are in the output window.

Step 10. Now you must add the Label Reference; for that use the following code.

public partial class Form1 : Form {
    Label firstclicked = null;
    Label secondclicked = null;

Step 11. Now you must modify the click event handler to use the first clicked event handler.

private void label_Click(object sender, EventArgs e)
{
    Label clickedLabel = sender as Label;
    if (clickedLabel != null)
    {
        if (clickedLabel.ForeColor == Color.Black)
            return;
        if (firstclicked == null)
        {
            firstclicked = clickedLabel;
            clickedLabel.ForeColor = Color.Black;
            return;
        }
    }
}

Now debug your program and on the output window click on any of the Labels. After clicking the first label none of the labels will appear that's because until now only the first clicked is working.

Step 12. Now add the Timer through the ToolBox, and change its Interval Property to 750 but leave the Enable Property to false. Double-click the Timer and add the following code to its Tick Event:

private void timer1_Tick(object sender, EventArgs e) {
    timer1.Stop();
    firstclicked.ForeColor = firstclicked.BackColor;
    secondclicked.ForeColor = secondclicked.BackColor;
    firstclicked = null;
    secondclicked = null;
}

Step 13. To Enable the timer into the label click add the following code to the label_Click Event.

private void label_Click(object sender, EventArgs e)
{
    if (timer1.Enabled == true)
        return;

    Label clickedLabel = sender as Label;

    if (clickedLabel != null)
    {
        if (clickedLabel.ForeColor == Color.Black)
            return;

        if (firstclicked == null)
        {
            firstclicked = clickedLabel;
            clickedLabel.ForeColor = Color.Black;
            return;
        }

        secondclicked = clickedLabel;
        secondclicked.ForeColor = Color.Black;
        timer1.Start();
    }
}

Debug your program, now you can click two labels one by one but both of them will disappear after some time.

Step 14. To keep pairs visible you must add the following code to the label_Click

secondclicked = clickedLabel;
secondclicked.ForeColor = Color.Black;
if (firstclicked.Text == secondclicked.Text)
{
    firstclicked = null;
    secondclicked = null;
    return;
}
timer1.Start();

Debug the program and start clicking the Icons, if you click the similar icons then they will remain shown but if you click a dis-similar Label then they disappear because the Timer's Tick event will be triggered.

Step 15. Your last step is to verify that the player has Won, for that must make a method "winner" as shown below.

private void winner()
{
    foreach (Control control in tableLayoutPanel1.Controls)
    {
        Label iconlabel = control as Label;
        if (iconlabel != null)
        {
            if (iconlabel.ForeColor == iconlabel.BackColor)
                return;
        }
    }
    MessageBox.Show("You Won, Congratulations");
    Close();
}

Now to againadd the code in the label_Click event, so that it can call the winner method when the player has Won.

secondclicked = clickedLabel;
secondclicked.ForeColor = Color.Black;
winner();
if (firstclicked.Text == secondclicked.Text) {
    firstclicked = null;
    secondclicked = null;
    return;
}

Now debug the program, play the game and if you Won then you will get a confirmation message like this.