csharp make two checkbox uncheckable both

                
                        private void chkBuried_CheckedChanged(object sender, EventArgs e)
{
    chkAboveGround.Checked = !chkBuried.Checked;
}
private void chkAboveGround_CheckedChanged(object sender, EventArgs e)
{
    chkBuried.Checked = !chkAboveGround.Checked;
}