C# - Reading an XML file and comparing data

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xml version="1.0"?>
<Filesigs>
  <Images>
    <sig name = "jpg">FF-0D-FF-E0</sig>
    <sig name = "jpg">FF-D8-FF-E8</sig>
    <sig name = "png">89-50-4E-47-0D-0A-1A-0A</sig>
    <sig name = "gif">47-49-46-38-37-61</sig>
    <sig name = "gif">47-49-46-38-39-61</sig>
    <sig name = "tiff">49-20-49</sig>
    <sig name = "tiff">49-49-2A-00</sig>
    <sig name = "bmp">42-4D</sig>
  </Images>
</Filesigs>

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Xml.Linq;

namespace WindowsFormsApplication5
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            // open file
            FileStream fs = new FileStream(@"C:\Users\Alan\Desktop\Koala.bob", FileMode.Open);
      
            // allocate buffer for whole file
            byte[] buffer = new byte[20];
            fs.Read(buffer, 0, 20);
            string hex = BitConverter.ToString(buffer);
            textBoxStoredExtension.Text = (Path.GetExtension(@"C:\Users\Alan\Desktop\Koala.bob"));
            string storedFileSig = (hex);
            //string storedFileSig = ("FF-0D-FF-E0");
            textBoxStored.Text = hex;
            XDocument myDoc = XDocument.Load("FileSigs.xml");
            IEnumerable result = from FileSigs in myDoc.Elements()
                                         from Images in FileSigs.Elements()
                                         from sigs in Images.Elements()
                                         where (storedFileSig.Contains(sigs.Value))
                                         select sigs.Attribute("name").Value;
            foreach (String r in result)
            {
                textBoxXMLExtension.Text = r;
            }
            //Console.ReadLine();
        }
    }
}