快速了解c# 结构体

struct Books
{
  public string title;
  public string author;
  public string subject;
  public int book_id;
}; 

public class testStructure
{
  public static void Main(string[] args)
  {

   Books Book1;    /* 声明 Book1，类型为 Book */
   Books Book2;    /* 声明 Book2，类型为 Book */

   /* book 1 详述 */
   Book1.title = "C Programming";
   Book1.author = "Nuha Ali";
   Book1.subject = "C Programming Tutorial";
   Book1.book_id = 6495407;

   /* book 2 详述 */
   Book2.title = "Telecom Billing";
   Book2.author = "Zara Ali";
   Book2.subject = "Telecom Billing Tutorial";
   Book2.book_id = 6495700;

   /* 打印 Book1 信息 */
   Console.WriteLine( "Book 1 title : {0}", Book1.title);
   Console.WriteLine("Book 1 author : {0}", Book1.author);
   Console.WriteLine("Book 1 subject : {0}", Book1.subject);
   Console.WriteLine("Book 1 book_id :{0}", Book1.book_id);

   /* 打印 Book2 信息 */
   Console.WriteLine("Book 2 title : {0}", Book2.title);
   Console.WriteLine("Book 2 author : {0}", Book2.author);
   Console.WriteLine("Book 2 subject : {0}", Book2.subject);
   Console.WriteLine("Book 2 book_id : {0}", Book2.book_id);   

   Console.ReadKey();

  }
}