C#类与结构

using System;

struct Books {
   private string title;
   private string author;
   private string subject;
   private int book_id;

   public void getValues(string t, string a, string s, int id) {
      title = t;
      author = a;
      subject = s;
      book_id = id;
   }

   public void display() {
      Console.WriteLine(Title : {0}, title);
      Console.WriteLine(Author : {0}, author);
      Console.WriteLine(Subject : {0}, subject);
      Console.WriteLine(Book_id :{0}, book_id);
   }
};  

public class testStructure {

   public static void Main(string[] args) {
      Books Book1 = new Books();   /* Declare Book1 of type Book */
      Books Book2 = new Books();   /* Declare Book2 of type Book */

      /* book 1 specification */
      Book1.getValues(C Programming,
      Nuha Ali, C Programming Tutorial,6495407);

      /* book 2 specification */
      Book2.getValues(Telecom Billing,
      Zara Ali, Telecom Billing Tutorial, 6495700);

      /* print Book1 info */
      Book1.display();

      /* print Book2 info */
      Book2.display(); 

      Console.ReadKey();
   }
}