private void button1_Click(object sender, EventArgs e)
{
timer1.Start();
}
private void button2_Click(object sender, EventArgs e)
{
timer1.Stop();
}
int i;
private void timer1_Tick(object sender, EventArgs e)
{
i=i+1;
if(i==7)
i=0;
switch (i)
{
case 1: textBox1.Text = "黄"; textBox1.BackColor = Color.Yellow; break; case 2:
case 3: textBox1.Text = "红"; textBox1.BackColor = Color.Red; break; case 4:
case 5:
case 6: textBox1.Text = "绿"; textBox1.BackColor = Color.Green; break;