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private DateTime dtStart;
private void button1_Click(object sender, EventArgs e)
{
dtStart = DateTime.Now;
this.timer1.Enabled = true;
}
private void timer1_Tick(object sender, EventArgs e)
{
this.label1.Text = Convert.ToDateTime(((TimeSpan)(DateTime.Now - dtStart)).ToString()).ToString("HH:mm:ss");
}