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();
   }
}