CheckBox: Windows FormsUse the CheckBox control from Windows Forms. Understand the CheckState property.
This page was last reviewed on Oct 9, 2022.
CheckBox. This control has 2 or 3 states. It provides a way for an option to be selected and deselected independently of other options.
Shows a checkbox
Getting started. Add a CheckBox control to your Windows Form in the designer view in Visual Studio. To use the CheckBox, add a Load event handler on the form.
CheckState. It is possible to set the CheckBox to allow three states. These include an indeterminate state as well as checked and unchecked.
Tip You can add event handlers and change properties by right-clicking on the CheckBox and selecting Properties.
Shows a checkbox
using System; using System.Windows.Forms; namespace WindowsFormsApplication4 { public partial class Form1 : Form { public Form1() { InitializeComponent(); // Acquire the state of the CheckBox. CheckState state = checkBox1.CheckState; // Demonstrate how the CheckBox can be switched upon. switch (state) { case CheckState.Checked: case CheckState.Indeterminate: case CheckState.Unchecked: { MessageBox.Show(state.ToString()); break; } } // Tell if the box is checked. MessageBox.Show(checkBox1.Checked.ToString()); } } }
CheckChanged. Typically, the CheckBox control is used alongside other controls. The CheckBox state is read when a user performs an action on another control, such as a button.
However The most useful event is probably CheckChanged—this event fires when the user clicks or changes the CheckBox.
And You can add the CheckChanged event handler by clicking on the lightning bolt and double-clicking on the CheckChanged name.
Summary. The CheckBox is useful control in Windows Forms. But it is not often a major focus of applications. It is instead a small, supporting control used with other controls.
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This page was last updated on Oct 9, 2022 (edit link).
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