private readonly string[] redNumbers = new string[] { "01", "02", "03", "04", "05",
    "06", "07", "08", "09", "10", "11",
    "12", "13", "14", "15", "16", "17",
    "18", "19", "20", "21", "22", "23"};

private readonly string[] blueNumbers = new string[] { "01", "02", "03", "04", "05",
    "06", "07", "08", "09", "10", "11",
    "12", "13", "14", "15", "16"};

private void Start()
{
    TaskFactory taskFactory = new TaskFactory();
    foreach(var control in this.groupBox1.Controls)
    {
        if(control is Label lab)
        {
            if (lab.Name.Contains("Blue"))
            {
                taskFactory.StartNew(() =>
                {
                    while (true)
                    {
                        var res = GetNumber(blueNumbers);//假设这是一个比较耗时的任务
                        lab.Text = redNumbers[res];
                    }
                });
            }
            else if (lab.Name.Contains("Red"))
            {
                taskFactory.StartNew(() =>
                {
                    while (true)
                    {
                        var res = GetNumber(redNumbers);//假设这是一个比较耗时的任务
                        lab.Text = redNumbers[res];	//.net中会有线程间操作无效的问题 在下文描述如何解决
                    }
                });
            }
        }
    }
}
private int GetNumber(string[] arrs)
{
    Random r = new Random(GetRandomSeed());
    int index = r.Next(0, arrs.Length);
    Thread.Sleep(r.Next(500, 1500));
    return index;
}

private int GetRandomSeed()
{
    byte[] buffer = Guid.NewGuid().ToByteArray();
    int iSeed = BitConverter.ToInt32(buffer, 0);
    return iSeed;
}

...
while (true)
{
    var resIndex = GetNumber(blueNumbers);//假设这是一个比较耗时的任务
    WriteTextSafe(lab, blueNumbers[resIndex]);
}
...


private void WriteTextSafe(Label lab, string text)
{
    if (lab.InvokeRequired)
    {
        lab.Invoke(() =>
        {
            lab.Text = text;
        });
    }
    else
        lab.Text = text;
}

private void Start(){
    ResetLabels();
    btnStart.Enabled = false;	//点击开始后  开始按钮被禁用

    ...
        else if (lab.Name.Contains("Red"))
        {
            taskFactory.StartNew(() =>
            {
                while (!btnStart.Enabled)
                {
                    var resIndex = GetNumber(redNumbers);//假设这是一个比较耗时的任务
                    if (IsRedExists(redNumbers[resIndex])) //红色号码球去重处理  如果存在就再随机一个号码
                    {
                        continue;
                    }
                    WriteTextSafe(lab, redNumbers[resIndex]);
                }
            });
        }
    ...

    // 运行工作线程  后台一直判断:  如果7个号码都开始产生出来了(都不为初始值)  那么此时 停止按钮启用
    Task.Run(() =>
    {
        while(!btnStop.Enabled)
        {
            if (!IsRedExists("00") && !labBlue01.Text.Equals("00"))
                BtnStatusSafe(btnStop, true);
        }
    });
}

private bool IsRedExists(string number)
{
    foreach(var control in groupBox1.Controls)
    {
        if (control is Label lbl
            && lbl.Name.Contains("Red")
            && lbl.Text.Equals(number))
            return true;
    }
    return false;
}

private void BtnStatusSafe(Button btn, bool status)
{
    if (btn.InvokeRequired)
        btn.Invoke(() =>
        {
            btn.Enabled = status;
        });
    else
        btn.Enabled = status;
}

private void btnStop_Click(object sender, EventArgs e)
{
    btnStop.Enabled = false;
    btnStart.Enabled = true;
}