How to use CheckBox Control

Drag and drop three checkboxes from the toolbox on window form.

Code:

using System;
using System.Text;
using System.Windows.Forms;
 
namespace WindowsFormsApplication1
{
     public partial class Form4 : Form
    {
         public Form4()
         {
            InitializeComponent();
         }
         private void checkBox1_CheckedChanged(object sender, EventArgs e)
         {
            //display checkbox value when checkbox1 is checked
            label1.Text = "Selected Language is " + checkBox1.Text;
         }
 
         private void checkBox2_CheckedChanged(object sender, EventArgs e)
         {
            //display checkbox value when checkbox2 is checked
            label1.Text = "Selected Language is " + checkBox2.Text;
         }
         private void checkBox3_CheckedChanged(object sender, EventArgs e)
         {
            //display checkbox value when checkbox3 is checked
            label1.Text = "Selected Language is " + checkBox3.Text;
         }
    }
}

Run the Project

When you select the given option then the CheckedChanged event will fire and the selected value will show in Label.

CheckBox Control Properties

CheckState:     The default value is Unchecked. Set it to True if you want a check to appear when form executed.

private void Form4_Load(object sender, EventArgs e)
{
     'check will appear at run time
      checkBox1.CheckState = CheckState.Checked;
}      

Output 

When the application runs then checkBox1 check state is checked.

Appearance: Default value is Normal. Set the value to Button if you want the CheckBox to be displayed as a Button.

private void Form4_Load(object sender, EventArgs e)
{
         //'set checkbox appearance as button
         checkBox1.Appearance = Appearance.Button;
         checkBox2.Appearance = Appearance.Button;
         checkBox3.Appearance = Appearance.Button;
}

Output

Now checkbox will show a button.

BackColor:    You can change the BackColor of CheckBox trough BackColor properties.

private void Form4_Load(object sender, EventArgs e)
{      // change the backcolor of checkbox
        checkBox1.BackColor = System.Drawing.Color.CadetBlue;
        checkBox2.BackColor = System.Drawing.Color.CadetBlue;
        checkBox3.BackColor = System.Drawing.Color.CadetBlue;
}

Output

At run, time checkbox backcolor will be changed.