using System;

public class Program

{

    public static void Main()

    {

        // Create a person

        Person a = new Person("Sally");

        // Shallow copy the person

        Person b = a.ShallowCopy();

        // Change the name of the second person

        b.firstName = "Bob";

        // Observe that the original person's name has not changed

        Console.WriteLine("First person is {0}", a.firstName);

        Console.WriteLine("Second person is {0}", b.firstName);

    }

}

​

public class Person

{

    public string firstName;

    public Person(string firstName)

    {

        this.firstName = firstName;

    }

    public Person ShallowCopy()

    {

        Person newPerson = (Person) this.MemberwiseClone();

        // Some online examples for deep copying will have this line, but it isn't 

        // necessarily needed to get the same effect.

        //      newPerson.firstName = this.firstName;

        // This is not due to strings not being a reference type, they ARE. But when 

        // the name is changed in a copied object a new string and reference are set

        // to that object while the original still holds the original reference, and 

        // therefore, the original string value. (strings are not updated, they are 

        // replaced, because they are immutable)

        return newPerson;

    }

}