Structures in c#

using System;

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;   /* Declare Book1 of type Book */

        Books Book2;   /* Declare Book2 of type Book */

        /* book 1 specification */

        Book1.title = "C# Programming";

        Book1.author = "Ahmed Ali";

        Book1.subject = "C# Programming Tutorial";

        Book1.book_id = 6495407;

        /* book 2 specification */

        Book2.title = "Software Engineering";

        Book2.author = "Zara Ali";

        Book2.subject = "Software Engineering Tutorial";

        Book2.book_id = 6495700;

        /* print Book1 info */

        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);

        /* print Book2 info */

        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();

    }

}