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ToggleButton.IsChecked Property

Gets or sets whether the ToggleButton is checked. This is a dependency property.

Namespace:  System.Windows.Controls.Primitives
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
[LocalizabilityAttribute(LocalizationCategory.None, Readability = Readability.Unreadable)]
public Nullable<bool> IsChecked { get; set; }
<object IsChecked="Boolean"/>- or -<object IsChecked="{x:Null Markup Extension}"/>

Property Value

Type: System.Nullable<Boolean>
true if the ToggleButton is checked; false if the ToggleButton is unchecked; otherwise null. The default is false.

Identifier field


Metadata properties set to true


A control that inherits from ToggleButton determines its behavior when this property is null.


When the IsThreeState property is set to true, a user can click a CheckBox to pick three possible states. The following table describes the three states of a CheckBox.

State of the CheckBox

Value of IsChecked







If IsThreeState is false, you can still programmatically set this property to null to put the CheckBox in an indeterminate state, but the user cannot set the CheckBox to the indeterminate state through the user interface (UI).


If you set this property to null on a RadioButton, the RadioButton is unchecked.

The following example creates a CheckBox set to an indeterminate state.

<CheckBox Name="checkBox1" IsThreeState="True" 
  A CheckBox in the indeterminate state

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0
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