Hi I wrote such code it works mostly perfect(you may use it)
but I don"t know how to add attributes to some TAGs for example I want to change Expire date to attribute of buyer
I want you suggesting how to add attributes

class Program
    {
        static void Main(string[] args)
        {
            Book[] books = FillBooks();
            FillXmlDoc(books);
        }
        //Fill Function
        static Book[] FillBooks()
        {
            Book[] books=new Book[5];
            for(int i=0;i<books.Length;i++)
            {
                books[i]=new Book("Terminator"+i,"Sergey M"+i,5.50+i*2,"King",DateTime.Today.AddDays(i+2));
            }
            return books;
        }
        //
        private static void FillXmlDoc(Book[] books)
        {
            //Name of XML file
            string filename="Books.xml";
            //Encoding and spacing
            XmlTextWriter write = new XmlTextWriter(filename, Encoding.UTF8);
            
            write.Formatting=Formatting.Indented;
            write.Indentation=3;
            write.WriteStartDocument();
            write.WriteStartElement("Books");
            foreach (Book b in books)
            {
            write.WriteStartElement("Book");
            write.WriteElementString("Name",b.Name);
            write.WriteElementString("Author",b.Author);
            write.WriteElementString("Price", b.Price.ToString());
            write.WriteStartElement("Expire");
            write.WriteElementString("Day", b.Expire.Day.ToString());
            write.WriteElementString("Month", b.Expire.Month.ToString());
            write.WriteElementString("Year", b.Expire.Year.ToString());


            }
                write.WriteEndElement();
		        write.WriteEndDocument();
                write.Close();
	     }

    }
}

and here the help class for this program

public class Book
    {
       private string name;
       private string author;
       private double price;
       private List<String> buyers= new List<String>();
       private DateTime expire;

       public string  Name 
       {
        get{ return name;}
        set{ name=value; }
       }
       public string  Author 
       {   get{return author;}
           set{author=value;}
       }
       public double Price
       {
           get{ return price;}
           set{price=value;}
       }

       public List<string> Buyers
       {
           get { return buyers; }
           set { buyers = value; }
       }
       
       
       
       
       
       
       
       public DateTime Expire
       {
           get { return expire; }
           set { expire = value; }
       }

       //ctor
       public Book()
       {

       }

       public Book(string name,string author,double price,string buyers,DateTime expire)
       {
           Name = name;
           Author = author;
           Price = price;
           Buyers.Add(buyers);
           Expire = expire;

       }
    }
}
....
 write.WriteStartElement("Buyer");
 write.WriteStartAttribute("ExpireDate");
 write.WriteString("1-1-2009");
 write.WriteEndAttribute();
 .....
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