How to Get All Uparas from the XML using XPATH and C#. XSL XSLT XPATH XML Using Regular Expression REGEX

using System.IO;
using System.Collections;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Linq;
using System.Xml.Xsl;
namespace XML_Parser
{
    class Program
    {
        public static Hashtable hash_table = new Hashtable();
        static void Main(string[] args)
        {
            string path = @"C:\Documents and Settings\saqib\My Documents\OMessenger\Received files\KOKODA-With Index.xml";
            string pattern = @"[a-z][a-z]+\.[a-z]+";
            XslCompiledTransform myxsl = new XslCompiledTransform();
            myxsl.Load("XSLTFile1.xslt");
            myxsl.Transform(path, "To_Table.html");
          //  var xDocument = XDocument.Load(path);
          //  string xmll = xDocument.ToString();
            XmlDocument xml =new XmlDocument();
            xml.Load(path);

XmlNodeList xnList = xml.SelectNodes("//upara");
//Console.WriteLine(xnList.Count);
foreach (XmlNode xn in xnList)

{
    //Console.WriteLine(xn.InnerText);
    string upara = xn.InnerText;
 
    MatchCollection matches = Regex.Matches(upara, pattern);
    foreach (Match match in matches)
    {
        foreach (Capture capture in match.Captures)
        {
            Console.WriteLine("Index={0}, Value={1}", capture.Index, capture.Value);
            hash_table.Add(capture.Index, capture.Value);
        }
    }

}
Console.ReadKey();
        }          
                    }
                }