Get sibling nodes before this node, in document order in CSharp

using System;//from  w w w  .j a v a2s .  c  o  m
using System.IO;
using System.Xml;
using System.Xml.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
public class MainClass{
   public static void Main(){
        XElement xmlTree = new XElement("Root",
            new XText("Text content."),
            new XElement("A1", "A1 content"),
            new XElement("A2", "A2 content"),
            new XText("More text content."),
            new XElement("A3", "A3 content")
        );
        XElement child = xmlTree.Element("A2");
        IEnumerable<XNode> nodes =
            from node in child.NodesBeforeSelf()
            select node;
        foreach (XNode node in nodes)
            Console.WriteLine("Node type: {0}  {1}",
                node.NodeType,
                node.NodeType == XmlNodeType.Text ? (node as XText).Value : "");

   }
}