XML C# Tutorial

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Xml;
    public class MainClass
    {
        public static void Main()
        {
            XmlReader reader;
            double totalPrice=0;
            
            reader = XmlReader.Create("pubs.xml");
            while (reader.Read())
            {
                if (reader.IsStartElement() && reader.Name=="titles")
                {
                    reader.MoveToAttribute("price");
                    totalPrice += reader.ReadContentAsDouble();
                }
            }
        }
    }