using System;
using System.IO;
using System.Xml;
using System.Xml.Linq;
using System.Collections;
using System.Collections.Generic;
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 XElement("A3", "A3 content"),
new XText("More text content."),
new XElement("A4", "A4 content"),
new XElement("A5", "A5 content")
);
XElement child = xmlTree.Element("A3");
IEnumerable elements = child.ElementsBeforeSelf();
foreach (XElement el in elements)
Console.WriteLine(el.Name);
}
}