using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Test fool = new Test() { Id = 1, Name = "Fool"};

        Test barry = new Test() { Id = 2, Name = "Barry"};

        Changer(fool);

        EducatedChanger(ref barry);

        Console.WriteLine("Fool");

        Console.WriteLine(fool.ToString());

        Console.WriteLine("Barry");

        Console.WriteLine(barry.ToString());

    }

    public static void Changer(Test obj)

    {

        obj.Name = "ChAnGeD!";

    }

    public static void EducatedChanger(ref Test obj)

    {

        obj.Name = string.Concat(string.IsNullOrWhiteSpace(obj.Name) ? string.Empty : obj.Name, " <- Changed");

    }

}

​

public class Test

{

    public int Id { get; set; }

    public string Name { get; set; }

    public override string ToString()

    {

        return "Id: " + Id.ToString() + "\n" + "Name: " + Name;

    }

}

​