Save button backcolor

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C#

buttons

I have made a simple app with 2 buttons. So when i press button 1 i change the button backcolor from red to green and the same for the second button. my question is how can i save the button backcolor statment when i close the app.
I tryied with the save settings but i fail.

What I have tried:

private void button1_Click(object sender, EventArgs e)
       {
           button1.BackColor = Color.LightGreen;
           button2.BackColor = Color.LightCoral;
       }
private void button2_Click(object sender, EventArgs e)
       {
           button2.BackColor = Color.LightGreen;
           button1.BackColor = Color.LightCoral;
       }