Answer Posted / jj

This example shows that when a struct is passed to a method,
a copy of the struct is passed, but when a class instance is
passed, a reference is passed.

// struct2.cs
using System;

class TheClass
{
public int x;
}

struct TheStruct
{
public int x;
}

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);
}
}

Output

a.x = 1
b.x = 5

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