private Knob Knob(string letter, int index = 0)
{
Knob found = null;
int count = 0;
knobs.ForEach(knob => {
if (knob.Text() == letter)
{
if (count == index)
{
found = knob;
}
count++;
}
});
if (found == null)
{
throw new InvalidOperationException("not a named knob: " + letter);
}
return(found);
}
private void ReleaseAllKnobs()
{
knobs.ForEach(knob => { Leave(knob); });
}
