Structs - Illustrated C# 2005 - page 287

Structs Are Value Types
As with all value types, a variable of a struct type contains its own data. Consequently

A variable of a struct type cannot be null .

￿

￿ Two structs cannot refer to the same object.

For example, the following code declares a class called CSimple , and a struct called Simple ,
and a variable of each. Figure 12-1 shows how the two would be arranged in memory.

class CSimple
{
public int x;
public int y;
}

struct Simple
{
public int x;
public int y;
}

class Program
{
static void Main()
{
CSimple cs = new CSimple();
Simple ss = new Simple();
...

Figure 12-1. Memory arrangement of a class versus a struct