using System;

using System.IO;

using System.Xml;

​

public class Sample

{

    public static void Main()

    {

        XmlDocument doc = new XmlDocument();

        doc.LoadXml(@"

            <container>

                <chapter>

                    <desc>

                        <diag>

                        </diag>

                        <diag>

                        </diag>

                    </desc>

                </chapter>

            </container>

");

        // Get and display all the book titles.

        XmlElement root = doc.DocumentElement;

        XmlNodeList elemList = root.GetElementsByTagName("chapter");

        Console.WriteLine(elemList.Count);

        for (int i = 0; i < elemList.Count; i++)

        {

            Console.WriteLine(elemList[i].Name);

        }

    }

}