C# 0 The Complete Reference

new

 to invoke a 

constructor or by simply declaring an object. If 

new

 is used, then the fields of the structure 

will be initialized either by the default constructor, which initializes all fields to their default 

value, or by a user-defined constructor. If 

new

 is not used, as is the case with 

book3

, then 

the object is not initialized, and its fields must be set prior to using the object.

When you assign one structure to another, a copy of the object is made. This is an 

important way in which 

struct

 differs from 

class

. As explained earlier in this book, when 

you assign one class reference to another, you are simply making the reference on the left 

side of the assignment refer to the same object as that referred to by the reference on the 

right. When you assign one 

struct

 variable to another, you are making a 

copy

 of the object on 

the right. For example, consider the following program:

// Copy a struct.

using System;

// Define a structure.

struct MyStruct {

  public int x;

}

// Demonstrate structure assignment.

class StructAssignment {

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