using System;

​

using System.Xml;

using System.Xml.Linq;

using System.Collections.Generic;

using System.ComponentModel;

using System.Xml.Serialization;

using System.IO;

public class Program

{

    public static void Main()

    {

        Library lib = new Library(myBooks: new MyBooks(

            genre: "classic",

            booklist: new List<Book>{

                new Book("1984", "George Orwell"),

                new Book("Robinson Crusoe", "Daniel Defoe"),

                new Book("Oliver Twist", "Mary Shelly"),

            }));

          XmlSerializer formatter = new XmlSerializer(typeof(Library));

​

            using (StringWriter sw = new StringWriter())

            {

                formatter.Serialize(sw, lib);

                Console.Write(sw.ToString());

            }

​

        string desiredOutput =

                @"<library>

​

                    <my.books genre =""classic"">

                        <book title = ""1984"" author=""George Orwell"" />

                        <book title = ""Robinson Crusoe"" author=""Daniel Defoe"" />

                        <book title = ""Frankenstein"" author=""Mary Shelly"" />

                    </my.books>

​

                </library>";

    }

​

[XmlRoot("library")]    

public class Library

        {

        [XmlElement("my.books")] 

        public MyBooks MyBooks { get; set; }

        public List<Book> Books { get; set; }

        public Library()

    {

    }

    public Library(MyBooks myBooks = null)

    {

        MyBooks = myBooks;

    }

}

​

[XmlType("my.books")]

public class MyBooks

{

     [XmlAttribute("genre")]

        public string Genre { get; set; }

     [XmlElement("book")]

        public List<Book> Booklist { get; set; }

      public MyBooks(string genre, List<Book> booklist = null)

        {

            Genre = genre;

            Booklist = booklist;

        }

          public MyBooks()

        {

​

        }

}   

public class Book

    {

        [XmlAttribute("title")]

        public string Title { get; set; }

        [XmlAttribute("author")]

        public string Author { get; set; }

        public Book() { }

        public Book(string title, string author)

        {

        Title = title;

        Author = author;    

        }

    }

}