C# 타이머

[fdsx(61.74)]

  private void button1_Clic(object sender, EventArgs e)
        {
            count = 3;
            timer1.Start();
           

        }

        private void timer1_Tick(object sender, EventArgs e)
        {

           
            label3.Text = "남은시간 : " + count.ToString();
            count--;
            if (count == 0)
            {
                timer1.Stop();
                label3.Text = "틀림";
                MessageBox.Show("시간초과");
               
            }
           
        }

왜 2초에서 1초넘어갈때  메세지 박스 뜨냐..???