using System;

​

public class TheClass

{

    public int x;

}

​

public struct TheStruct

{

    public int x;

}

​

public class TestClass

{

    public static void structtaker(TheStruct s)

    {

        s.x = 5;

    }

    public static void classtaker(TheClass c)

    {

        c.x = 5;

    }

    public static void Main()

    {

        TheStruct a = new TheStruct();

        TheClass b = new TheClass();

        a.x = 1;

        b.x = 1;

        structtaker(a);

        classtaker(b);

        Console.WriteLine("a.x = {0}", a.x);

        Console.WriteLine("b.x = {0}", b.x);

    }

}

//The output of the example shows that only the value of the class field was changed 

//  when the class instance was passed to the classtaker method. The struct field, however,

//did not change by passing its instance to the structtaker method. This is because a copy of the struct was passed to the structtaker method, 

//  while a reference to the class was passed to the classtaker method.