How to reset the timer count down?

Question

When it finish counting down from 1 minute to 00:00:00 then restart the timer over again counting back 1 minute. and I want it to start automatic over again inside the tick event and i want to know also how to call it from other places in the application and restart it from there again to count backward 1 minutes or any other times. The timer interval is set to 100 and I start the timer somewhere in my form1 code in a button click event. The timer is already in the form1 designer.

DateTime target = DateTime.Now + TimeSpan.FromMinutes(1);
private void timer1_Tick(object sender, EventArgs e)
{
    var countdown = target - DateTime.Now;

    // Display time with milliseconds
    lblTimer.Text = $"{countdown.Hours:D2}:{countdown.Minutes:D2}:{countdown.Seconds:D2}";//:{(int)countdown.TotalMilliseconds:D3}";
}

Answer 1

this is working.

DateTime target = DateTime.Now + TimeSpan.FromMinutes(1);
private void timer1_Tick(object sender, EventArgs e)
{
    var countdown = target - DateTime.Now;

    if (countdown <= TimeSpan.Zero)
    {
        // Reset the target to 1 minute from now
        target = DateTime.Now + TimeSpan.FromMinutes(1);
    }

    // Display time without milliseconds
    lblTimer.Text = $"{countdown.Hours:D2}:{countdown.Minutes:D2}:{countdown.Seconds:D2}";
}