private void timer1_Tick(object sender, EventArgs e) { if (Ss == 0 && Mm == 0 && Hh == 0) { this.Close(); Environment.Exit(0); } if (Ss == 0) { if (Mm == 0) { Hh--; Mm += 59; Ss += 59; } else { Mm--; Ss += 59; } } else { Ss--; } textBox1.Text = (Hh < 10 ? "0" + Hh.ToString() : Hh.ToString()); textBox2.Text = (Mm < 10 ? "0" + Mm.ToString() : Mm.ToString()); textBox3.Text = (Ss < 10 ? "0" + Ss.ToString() : Ss.ToString()); }