using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Xml;

using System.Xml.Linq;

using System.Text;

public class Program

{

    public static void Main()

    {

        XElement root = new XElement("Root",

                                     new XAttribute("a", "bb"),

    new XElement("Child", 0),

    new XElement("Child", new XElement("Grandchild", new XElement("Child", 25))),

    new XElement("Child", new XAttribute("Source", "abc"), 2),

    new XElement("Child", 3),

    new XElement("Child", 4, new XAttribute("x", "y")),

    new XElement("Child", 5)

);

Console.WriteLine(root);

Console.WriteLine("1---");

var el = root.Element("Child");

        el.Remove();

Console.WriteLine(root);

Console.WriteLine("2---");

Console.WriteLine(el);

Console.WriteLine("3---");

Console.WriteLine(string.Join(", ", root.Elements("Child").Where(o => o.Attribute("Source") != null).Select(x => x.ToString())));

Console.WriteLine("4---");

var desc = root.Elements("Child").ToList();

        desc.ForEach(x => Console.WriteLine(x));

Console.WriteLine("5---");

desc = root.Descendants("Child").ToList();

        desc.ForEach(x => Console.WriteLine(x));

​

    }

}