WPF grouping for checkboxes

    <CheckBox Content="1" Margin="43,73,430,227" />
    <CheckBox  Content="2" Margin="123,73,359,227"/>
</Grid>

Above are my checkboxe. I need to group them. I f check 1 then 2 should be unchecked and vice versa. This should be done in xaml. Is there any property settings or xaml code to apply my requirement other than adding c# code.