Black Tulip

private void button1_Click(object sender, EventArgs e)
{
    if (timer1.Enabled)
    {
        timer1.Enabled = false;

        button1.Text = "Пуск";
        button2.Enabled = true;

        button1.Text = "Стоп";
        button2.Enabled = false;

    }
}

private void timer1_Tick(object sender, EventArgs e)
{
    if (label3.Visible)
    {
        if (s < 59)
        {
            s++;
            if (s < 10)
                label2.Text = s.ToString();

        }
        else
        {
            m = 0;
            label1.Text = "00";
        }
        label3.Visible = false;
    }        
    else 
        label3.Visible = true;
}