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CheckBox in C#
  • Last Updated : 25 Jun, 2019

The CheckBox control is the part of windows form which is used to take input from the user. Or in other words, CheckBox control allows us to select single or multiple elements from the given list or it can provide us options like yes or no, true or false, etc. It can be displayed as an image or text or both. The CheckBox is a class and defined under System.Windows.Forms namespace. In Windows form, you can create CheckBox in two different ways:

1. Design-Time: It is the simplest way to create a CheckBox using the following steps:

  • Step 1: Create a windows form as shown in the below image:
    Visual Studio -> File -> New -> Project -> WindowsFormApp
  • Step 2: Drag the CheckBox control from the ToolBox and drop it on the windows form. You can place CheckBox anywhere on the windows form according to your need.
  • Step 3: After drag and drop you will go to the properties of the CheckBox control to modify the CheckBox design according to your requirement.

    Output:

2. Run-Time: It is a little bit trickier than the above method. In this method, you can create your own checkbox programmatically using the CheckBox class.

  • Step 1: Create a checkbox using the CheckBox() constructor provided by the CheckBox class.
    // Creating checkbox
    CheckBox Mycheckbox = new CheckBox();
    
  • Step 2: After creating CheckBox, set the properties of the CheckBox provided by the CheckBox class.
    // Set height of the checkbox
     Mycheckbox.Height = 50;
    
    // Set width of the checkbox
    Mycheckbox.Width = 100;
    
    // Set location of the checkbox
    Mycheckbox.Location = new Point(229, 136);
    
    // Set text in the checkbox
    Mycheckbox.Text = "Married";
    
    // Set font of the checkbox
    Mycheckbox.Font = new Font("Bradley Hand ITC", 12);
    
  • Step 3 : And last add this checkbox control to form using Add() method.
    // Add this checkbox to form
    this.Controls.Add(Mycheckbox);
    

    Example:




    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Forms;
      
    namespace WindowsFormsApp5 {
      
    public partial class Form1 : Form {
      
        public Form1()
        {
            InitializeComponent();
        }
      
        private void Form1_Load(object sender, EventArgs e)
        {
            // Creating and setting the properties of label
            Label l = new Label();
            l.Text = "Select Status:";
            l.AutoSize = true;
            l.Location = new Point(233, 111);
            l.Font = new Font("Bradley Hand ITC", 12);
            // Adding lable to form
            this.Controls.Add(l);
      
            // Creating and setting the properties of CheckBox
            CheckBox Mycheckbox = new CheckBox();
            Mycheckbox.Height = 50;
            Mycheckbox.Width = 100;
            Mycheckbox.Location = new Point(229, 136);
            Mycheckbox.Text = "Married";
            Mycheckbox.Font = new Font("Bradley Hand ITC", 12);
      
            // Adding checkbox to form
            this.Controls.Add(Mycheckbox);
      
            // Creating and setting the properties of CheckBox
            CheckBox Mycheckbox1 = new CheckBox();
            Mycheckbox1.Location = new Point(230, 198);
            Mycheckbox1.Text = "UnMarried";
            Mycheckbox1.AutoSize = true;
            Mycheckbox1.Font = new Font("Bradley Hand ITC", 12);
      
            // Adding checkbox to form
            this.Controls.Add(Mycheckbox1);
        }
    }
    }

    Output:

Important Properties of CheckBox

PropertyDescription
AppearanceThis property is used to gets or sets the value that indicates the appearance of a CheckBox control.
AutoCheckThis property is used to set a value which shows whether the Checked or CheckState values and the CheckBox appearance are automatically changed when you click the CheckBox.
AutoEllipsisThis property is used to get or set a value which determine whether the ellipsis character (…) appears at the right edge of the control, denoting that the control text extends beyond the specified length of the control.
AutoSizeThis property is used to get or set a value that determines whether the control resizes based on its contents.
BackColorThis property is used to get or set the background color of the control.
BackgroundImageThis property is used to get or set the background image displayed in the control.
CheckStateThis property is used to get or set the state of the CheckBox.
CheckAlignThis property is used to get or set the horizontal and vertical alignment of the check mark on a CheckBox control.
CheckedThis property is used to get or set a value which determine whether the CheckBox is in the checked state.
EventsThis property is used to get the list of event handlers that are attached to this Component.
FontThis property is used to get or set the font of the text displayed by the control.
ForeColorThis property is used to get or set the foreground color of the control.
ImageThis property is used to get or set the image that is displayed on a checkbox control.
LocationThis property is used to get or set the coordinates of the upper-left corner of the CheckBox control relative to the upper-left corner of its form.
MarginThis property is used to get or set the space between controls.
NameThis property is used to get or set the name of the control.
PaddingThis property is used to get or set padding within the control.
TextThis property is used to get or set the text associated with this control.
TextAlignThis property is used to get or set the alignment of the text on the CheckBox control.
VisibleThis property is used to get or set a value which determine whether the control and all its child controls are displayed.

Important Events on CheckBox

EventDescription
CheckedChangedThis event occur when the value of the Checked property changes.
CheckStateChangedThis event occur when the value of the CheckState property changes.
ClickThis event occur when the control is clicked.
DoubleClickThis event occur when the user double-clicks the CheckBox control.
LeaveThis event occur when the input focus leaves the control.
MouseClickThis event occur when the control is clicked by the mouse.
MouseDoubleClickThis event occur when the user double-clicks the CheckBox control.
MouseHoverThis event occur when the mouse pointer rests on the control.

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