double nTotalSeconds = 90;
DateTime dt;
private void Form_Load(object sender, EventArgs e)
{
dt = new DateTime();
timer1.Interval = 1000;
timer1.Enabled = true;
}
private void timer1_Tick(object sender, EventArgs e)
{
nTotalSeconds--;
textBox1.Text = dt.AddSeconds(nTotalSeconds).ToString("HH:mm:ss");
if(nTotalSeconds == 0)
timer1.Enabled = false;
}
출력
00:01:30
00:01:29
00:01:28
.
.
.
00:00:00