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. In CheckBox, you are allowed to get or set the state of the CheckBoxes using the CheckState property of the CheckBox. In CheckBox, there are three different types of states are available:
CheckState | For Normal Appearance | For Button Appearance |
---|---|---|
Checked | The CheckBox shows a check mark. | The control looks sunken. |
UnChecked | The CheckBox is vacant. | The control looks raised. |
Indeterminate | The CheckBox shows a check mark and is shaded. | The control looks flat. |
The default value of the CheckState property is Unchecked. In Windows form, you can set this property in two different ways:
1. Design-Time: It is the simplest way to set the CheckState property of 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 set the state of the CheckBox using CheckState property.
Output:
2. Run-Time: It is a little bit trickier than the above method. In this method, you can set the CheckState property of a CheckBox programmatically using the following syntax:
public System.Windows.Forms.CheckState CheckState { get; set; }
Here, the CheckState is used to represent the CheckState enumeration values. It also throws an InvalidEnumArgumentException if the value assigned to the CheckState property does not belong to the CheckState enumeration values. Following steps are used to set the CheckState property of the CheckBox:
- 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 CheckState property of the CheckBox provided by the CheckBox class.
// Set the CheckState property of the CheckBox Mycheckbox1.CheckState = CheckState.Indeterminate;
- 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 Gender:"
;
l.Location =
new
Point(233, 111);
// 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 =
"Male"
;
Mycheckbox.CheckState = CheckState.Unchecked;
// Adding checkbox to form
this
.Controls.Add(Mycheckbox);
// Creating and setting the properties of CheckBox
CheckBox Mycheckbox1 =
new
CheckBox();
Mycheckbox1.Height = 50;
Mycheckbox1.Width = 100;
Mycheckbox1.Location =
new
Point(230, 174);
Mycheckbox1.Text =
"Female"
;
Mycheckbox1.CheckState = CheckState.Indeterminate;
// Adding checkbox to form
this
.Controls.Add(Mycheckbox1);
}
}
}
Output:
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