ThreeState Property

CheckBox.ThreeState Property


Gets or sets a value indicating whether the CheckBox will allow three check states rather than two.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

member ThreeState : bool with get, set

Property Value

Type: System.Boolean

true if the CheckBox is able to display three check states; otherwise, false. The default value is false.

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

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 code 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.

No code example is currently available or this language may not be supported.

.NET Framework
Available since 1.1
Return to top
© 2015 Microsoft