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XPathNavigator Evaluate Uses context to evaluate the XPathExpression

using System; using System.Linq; using System.Xml; using System.Xml.Linq; using System.Collections; using System.Collections.Generic; using System.Xml.XPath; public class MainClass{    public static void Main(){                      XPathDocument document = new XPathDocument("books.xml");         XPathNavigator navigator = document.CreateNavigator();                  XPathNodeIterator nodes = navigator.Select("//book");         XPathExpression query = nodes.Current.Compile("sum(descendant::price)");                  Double total = (double)navigator.Evaluate(query, nodes);         Console.WriteLine("Total price for all books: {0}", total.ToString());     } }