Can I "reverse" a Boolean value- Can I 'invert' a bool?

problem ：

I have some checks to see if a screen is active. I have some checks to see if the screen is active .The code looks like this: The code is as follows ：

if (GUI.Button(new Rect(Screen.width / 2 - 10, 50, 50, 30), "Rules")) //Creates a button    {        if (ruleScreenActive == true) //check if the screen is already active            ruleScreenActive = false; //handle according to that        else             ruleScreenActive = true;    }

Is there any way to - whenever I click the button - invert the value of ruleScreenActive ? What can be done - Whenever I click a button - reverse ruleScreenActive Value ？

(This is C# in Unity3D)（ This is a Unity3D Medium C#）

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Solution ：

Reference resources ： https://stackoom.com/en/question/bOVd