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// Assigning two intrinsic value types results in

// two independent variables on the stack.

static void ValueTypeAssignment()

{

Console.WriteLine("Assigning value types\n");

Point p1 = new Point(10, 10);

Point p2 = p1;

// Print both points.

p1.Display();

p2.Display();

// Change p1.X and print again. p2.X is not changed.

p1.X = 100;

Console.WriteLine("\n=> Changed p1.X\n");

p1.Display();

p2.Display();

}

Here you have created a variable of type Point (named p1) that is then assigned to another

Point (p2). Because Point is a value type, you have two copies of the MyPoint type on the stack, each

of which can be independently manipulated. Therefore, when you change the value of p1.X, the

value of p2.X is unaffected. Figure 4-10 shows the output once this method is called from Main().

Figure 4-10.

Assignment of value types results in a verbatim copy of each field.

In stark contrast to value types, when you apply the assignment operator to reference types

(meaning all class instances), you are redirecting what the reference variable points to in memory.

To illustrate, create a new class type named PointRef that has the exact same members as the Point

structures, beyond renaming the constructor to match the class name: