A RadioButton has two states: true or false.

Content Model: RadioButton is a ContentControl. Its content property is Content. For more information on the content model for RadioButton, see Controls Content Model Overview.

The RadioButton is a control that is usually used as an item in a group of RadioButton controls. However, it is possible to create a single RadioButton. Whether a RadioButton is selected is determined by the state of its IsChecked property.

When a RadioButton is selected, it cannot be cleared by clicking it. When RadioButton elements are grouped, the buttons are mutually exclusive. A user can select only one item at a time within a RadioButton group. You can group RadioButton controls by placing them inside a parent or by setting the GroupName property on each RadioButton.

Dependency properties for this control might be set by the control’s default style. If a property is set by a default style, the property might change from its default value when the control appears in the application. The default style is determined by which desktop theme is used when the application is running. For more information, see Themes.

The following example shows how to create RadioButton controls, group them inside a container, and handle the Checked event.

<StackPanel>
  <RadioButton Name="rb1" Checked="WriteText2">Yes</RadioButton>
  <RadioButton Name="rb2" Checked="WriteText2">No</RadioButton>
  <RadioButton Name="rb3" Checked="WriteText2">No opinion</RadioButton>
</StackPanel>

Private Sub WriteText2(ByVal Sender As Object, ByVal e As RoutedEventArgs)

    Dim li As RadioButton = CType(Sender, RadioButton)
    txtb.Text = "You clicked " + li.Content.ToString() + "."

End Sub

void WriteText2(object sender, RoutedEventArgs e)
{
    RadioButton li = (sender as RadioButton);
    txtb.Text = "You clicked " + li.Content.ToString() + ".";
}

The following code sample creates two separate RadioButton groups: colorgrp and numgrp. The user can choose one RadioButton in each group.

<StackPanel>
  <RadioButton GroupName="colorgrp">Red</RadioButton>
  <RadioButton GroupName="colorgrp">Blue</RadioButton>
  <RadioButton GroupName="numgrp">1</RadioButton>
  <RadioButton GroupName="numgrp">2</RadioButton>
</StackPanel>

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

.NET Framework

Reference

Other Resources