How do I save ''user control'' data?

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C#

Visual-Studio

I made multiple user controls to use them as pages and every user control page does some mathematical operation and sorts result in a label. Now i want to make "user control" save that label value every time i close the program. I don't know how to save it since it doesn't have "closed" event like form does.

What I have tried:

private void Form1_FormClosed(object sender, FormClosedEventArgs e)
       {
           Properties.Settings.Default.label = label1.txt;
           Properties.Settings.Default.Save();
       }