using System;

​

public class Program

{

    class Employee

    {

        public string FirstName

        {

            get;

            set;

        }

​

        public string LastName

        {

            get;

            set;

        }

​

        public override string ToString()

        {

            return string.Format("{0} {1}", this.FirstName, this.LastName);

        }

    }

​

    public static void Main()

    {

        var em = new Employee{FirstName = "Zbyszek", LastName = "Kowalski"};

        Modify(em);

        Console.WriteLine(em.ToString());

        var ep = new Employee{FirstName = "Zbigniew", LastName = "Kowalski"};

        ModifyRef(ref ep);

        Console.WriteLine(ep.ToString());

    }

​

    static void Modify(Employee emp)

    {

        emp = new Employee { FirstName = "Szymon", LastName = "Nowak" };

    }

    static void ModifyRef(ref Employee emp)

    {

        emp = new Employee { FirstName = "Szymek", LastName = "Nowak" };

    }

}