How to stretch the time from the timer for the time spent?

Interested seconds and milliseconds

private void Start(object sender, MouseEventArgs e) { timer1.Enabled = true; timer1.Start(); } private void Stop(object sender, MouseEventArgs e) { timer1.Stop(); timer1.Enabled = false; textBox1.AppendText("" + Environment.NewLine); }

    1 answer 1

      private DateTime startTime; private void Start(object sender, MouseEventArgs e) { startTime = DateTime.Now; timer1.Enabled = true; timer1.Start(); } private void Stop(object sender, MouseEventArgs e) { timer1.Stop(); timer1.Enabled = false; textBox1.AppendText((DateTime.Now - startTime).ToString() + Environment.NewLine); }