using System;

public class Program

{

    public class TestRefClass{

        public int i;

        public TestRefClass ShallowCopy()

        {

           return (TestRefClass) this.MemberwiseClone();

        }

    }

    public static void Main()

    {

        var myClasswithClone = new TestRefClass(){i = 1};

        Console.WriteLine($"myClasswithClone.i: {myClasswithClone.i}");

        modifywithclone(myClasswithClone);

        Console.WriteLine($"myClasswithClone.i: {myClasswithClone.i}");

        var myClassNoClone = new TestRefClass(){i = 1};

        Console.WriteLine($"myClassNoClone.i: {myClassNoClone.i}");

        modifynoclone(myClassNoClone);

        Console.WriteLine($"myClassNoClone.i: {myClassNoClone.i}");

​

    }

    private static int modifywithclone(TestRefClass tobechanged)

    {

        TestRefClass mylocal = tobechanged.ShallowCopy();

        return mylocal.i+=1;

    }   

    private static int modifynoclone(TestRefClass tobechanged)

    {

        return tobechanged.i+=1;

    }

}