void UpdateButton_Click (object sender, EventArgs ea)
{
int cur = _buttonPhase;
_buttonPhase = (_buttonPhase + 1) % ButtonPhaseCount;
switch (cur) {
case 0:
_statusLabel.Text = new string ('c', 30);
break;
case 1:
_statusLabel.Text = new string ('b', 20);
break;
case 2:
_statusLabel.Text = new string ('a', 10);
break;
}
}