Make timer do something once then stop...

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C#

Hi guys. How do I make my timer1 check if there are files with a certain extension on the desktop, and if there are, I want timer1 to start timer2 and do an action ONCE, then I want the timer2 to stop.

Here is my code so far... as you can see I have the code for checking if files with the extensions ".rtf" exist on the desktop, and if it does exist timer 1 will start timer 2 which will start an action. But as you may have understood by now, I want the action to be done once, then I want the timer to stop.

private void Form1_Load(object sender, EventArgs e)
        {
            timer1.Start();
        }
private void timer1_Tick(object sender, EventArgs e)
        {
            string[] files = Directory.GetFiles(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory), "*.rtf");
if (files.Length > 0)
    {
        timer2.Start();
    }

        }
        private void timer2_Tick(object sender, EventArgs e)
        {
           startAction();
                                
        }

What I have tried: