using System;

public class Program

{

    public static void Main()

    {

        //Group A

        var initialValue = new A();

        initialValue.SomeValue = "Initial Value - Keep this";

        var modifiedForMeONly = ModifyForThisOnly(initialValue);

        //Group B

        var x = 6;

        var y = ModifyANumberOnly(x);

        //Output A

        Console.WriteLine(initialValue.SomeValue);//You still want this to be the original value

        Console.WriteLine(modifiedForMeONly.SomeValue);

        //Output B

        Console.WriteLine(x);

        Console.WriteLine(y);

    }

    public static A ModifyForThisOnly(A ReceivedValue){

       ReceivedValue.SomeValue = "SomeOtherValue";

       return ReceivedValue;

    }

​

    public static int ModifyANumberOnly(int ReceivedValue){

       ReceivedValue = 5;

       return ReceivedValue;

    }

}

​

public class A {

    public string SomeValue {get;set;}

}

​

​

​

​