Радіокнопка (RadioButton)

<StackPanel x:Name="stackPanel">

     <RadioButton GroupName="Languages" Content="C#" IsChecked="True" />

     <RadioButton GroupName="Languages" Content="VB.NET" />

     <RadioButton GroupName="Languages" Content="C++" />

     <RadioButton GroupName="Technologies" Content="WPF" IsChecked="True" />

     <RadioButton GroupName="Technologies" Content="WinForms" />

</StackPanel>

if(MyRadioButton.IsChecked == true) {

}