C# one button to have 2 functions?

Hi,

I'm trying to make one button have two functions for my C# project, press it once to open a form and then press it again to close that same for that opened, how can I do this please? I can show you the code I had done so far, it's nothing special.

The button opens my setting form that has setting such as turn music on and off, and other functions for the user.

What I have tried:

//Code below opens the game settings menu.
private void SettingsBTN_Click(object sender, EventArgs e)
{
Kid_Merchant_Hero.GameSettings f = new Kid_Merchant_Hero.GameSettings();
f.Show();
}

Tags: C#