Hello
If you have 3 Items (Book, Cd, Both):
private void Both_CheckedChanged(object sender, EventArgs e)
{
Book.Checked = true;
Cd.Checked = true;
}
private void Book_CheckedChanged(object sender, EventArgs e)
{
if (!Both.Checked)
Cd.Checked = !Book.Checked;
if (!Book.Checked)
Both.Checked = false;
}
private void Cd_CheckedChanged(object sender, EventArgs e)
{
if (!Both.Checked)
Book.Checked = !Cd.Checked;
if (!Cd.Checked)
Both.Checked = false;
}