C# 中的计时器 怎么让一个计时器先执行完了之后，再让第二个执行

谢谢

嗯 ，  呵呵   我已经做好了

using System;
using System.Collections.Generic;
using
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace T6.红绿灯
{
    public partial class frmRedGreen2 : Form
    {
        int red, yello, green, count = 0;

        public frmRedGreen2()
        {
            InitializeComponent();
        }

        private void frmRedGreen2_Load(object sender, EventArgs e)
        {
            pbImage.Image=imageL.Images[0];
        }

        private void button1_Click(object sender, EventArgs e)
        {
            red=Convert.ToInt32(txtRed.Text.ToString());
            
            yello = Convert.ToInt32(txtYello.Text.ToString());

            green = Convert.ToInt32(txtGreen.Text.ToString());
        }
        private void btnStart_Click(object sender, EventArgs e)
        {
            Time.Enabled = true;
            count = red;
            
        }
        private void Time_Tick(object sender, EventArgs e)
        {
            pbImage.Image = imageL.Images[1];
            lblTime.Text = count.ToString();
            count--;
            if (count==0)
            {
                Time1.Enabled = true;
                Time.Enabled = false;
                count = yello;
            }
        }

        private void Time1_Tick(object sender, EventArgs e)
        {
            pbImage.Image = imageL.Images[2];
            lblTime.Text = count.ToString();
            count--;
            if (count == 0)
            {
                Time2.Enabled = true;
                Time1.Enabled = false;
                count = green;
            }
        }

        private void Time2_Tick(object sender, EventArgs e)
        {
            pbImage.Image=imageL.Images[3];
            lblTime.Text = count.ToString();
            count--;
            if (count == 0)
            {
                Time.Enabled = true;
                Time2.Enabled = false;
                count = red;
            }
        }

        private void btbStop_Click(object sender, EventArgs e)
        {
            Time.Enabled = false;
            Time1.Enabled = false;
            Time2.Enabled = false;
        }

      


    }
}