using System;

public class Program

{

    public static void ChangeIt(ref bool changeMe)

    {

        changeMe=false;

    }

    public static void Main()

    {

        var myBool = true;

        Console.WriteLine($"My bool is {myBool}");

        ChangeIt(ref myBool);

        Console.WriteLine($"Now my bool is {myBool}");

    }

}