CheckBox.CheckState Property

Reference

Definition

Namespace:: System.Windows.Forms

Assembly:: System.Windows.Forms.dll

Source:: CheckBox.cs

Source:: CheckBox.cs

Source:: CheckBox.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets or sets the state of the CheckBox.

public:
 property System::Windows::Forms::CheckState CheckState { System::Windows::Forms::CheckState get(); void set(System::Windows::Forms::CheckState value); };

[System.ComponentModel.Bindable(true)]
public System.Windows.Forms.CheckState CheckState { get; set; }

[<System.ComponentModel.Bindable(true)>]
member this.CheckState : System.Windows.Forms.CheckState with get, set

Public Property CheckState As CheckState

Property Value

CheckState

One of the CheckState enumeration values. The default value is Unchecked.

Attributes: BindableAttribute

Exceptions

InvalidEnumArgumentException

The value assigned is not one of the CheckState enumeration values.

Examples

The following code example displays the values of three properties in a label. The ThreeState property alternates between true and false with alternating clicks of the control and the CheckAlign alternates between the MiddleRight and MiddleLeft values of System.Drawing.ContentAlignment. This example shows how the property values change as the ThreeState property changes and the control is checked. This example requires that a CheckBox, Label and Button have all been instantiated on a form and that the label is large enough to display three lines of text, as well as a reference to the System.Drawing namespace. This code should be called in the Click event handler of the control.

private:
   void AdjustMyCheckBoxProperties()
   {
      // Concatenate the property values together on three lines.
      label1->Text = String::Format( "ThreeState: {0}\nChecked: {1}\nCheckState: {2}",
         checkBox1->ThreeState, checkBox1->Checked, checkBox1->CheckState );
      
      // Change the ThreeState and CheckAlign properties on every other click.
      if ( !checkBox1->ThreeState )
      {
         checkBox1->ThreeState = true;
         checkBox1->CheckAlign = ContentAlignment::MiddleRight;
      }
      else
      {
         checkBox1->ThreeState = false;
         checkBox1->CheckAlign = ContentAlignment::MiddleLeft;
      }
   }

private void AdjustMyCheckBoxProperties()
 {
    // Change the ThreeState and CheckAlign properties on every other click.
    if (!checkBox1.ThreeState)
    {
       checkBox1.ThreeState = true;
       checkBox1.CheckAlign = ContentAlignment.MiddleRight;
    }
    else
    {
       checkBox1.ThreeState = false;
       checkBox1.CheckAlign = ContentAlignment.MiddleLeft;
    }

    // Concatenate the property values together on three lines.
    label1.Text = "ThreeState: " + checkBox1.ThreeState.ToString() + "\n" +
                  "Checked: " + checkBox1.Checked.ToString() + "\n" +
                  "CheckState: " + checkBox1.CheckState.ToString(); 
 }

Private Sub AdjustMyCheckBoxProperties()

    ' Change the ThreeState and CheckAlign properties on every other click.
    If Not checkBox1.ThreeState Then
        checkBox1.ThreeState = True
        checkBox1.CheckAlign = ContentAlignment.MiddleRight
    Else
        checkBox1.ThreeState = False
        checkBox1.CheckAlign = ContentAlignment.MiddleLeft
    End If

    ' Concatenate the property values together on three lines.
    label1.Text = "ThreeState: " & checkBox1.ThreeState.ToString() & ControlChars.Cr & _
        "Checked: " & checkBox1.Checked.ToString() & ControlChars.Cr & _
        "CheckState: " & checkBox1.CheckState.ToString()

End Sub

Remarks

If the ThreeState property is set to false, the CheckState property value can only be set to CheckState.Indeterminate in code and not by user interaction.

The following table describes the System.Windows.Forms.Appearance of the CheckBox control in its different states for the Normal and Button style control CheckBox.Appearance.

CheckState	Appearance.Normal	Appearance.Button
`Checked`	The CheckBox displays a check mark.	The control appears sunken.
`Unchecked`	The CheckBox is empty.	The control appears raised.
`Indeterminate`	The CheckBox displays a check mark and is shaded.	The control appears flat.

Applies to

Product	Versions
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
Windows Desktop	3.0, 3.1, 5, 6, 7, 8, 9, 10

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