difference of two xml file will be displayed in third xml file

<?xml version="1.0" encoding="utf-8"?>
<wpassetd>
  <Main>
    <data>
      <machinename><![CDATA[zomy]]></machinename>
      <scandate><![CDATA[03/23/2014 10:56:34]]></scandate>
      <guid><![CDATA[31c0841e-f7bf-4de1-9d75-7e9080498e6b-20141216020243430495]]></guid>
      <regid><![CDATA[2853611]]></regid>
    </data>
  </Main>
</wpassetd>

test2.xml:

<?xml version="1.0" encoding="utf-8"?>
<wpassetd>
  <Main>
    <data>
      <machinename><![CDATA[zomy]]></machinename>
      <scandate><![CDATA[03/23/2015 18:56:34]]></scandate>
      <guid><![CDATA[31c0841e-f7bf-4de1-9d75-7e9080498e6b-20141216020243430495]]></guid>
      <regid><![CDATA[2853622]]></regid>
    </data>
  </Main>
</wpassetd>


output.xml should be difference of test1.xml and test2.xml:

<?xml version="1.0" encoding="utf-8"?>
<wpassetd>
  <Main>
    <data>
       <scandate><![CDATA[03/23/2015 18:56:34]]></scandate>
       <regid><![CDATA[2853622]]></regid>
    </data>
  </Main>
</wpassetd>




using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Xml.Linq;


namespace ConsoleApplication15
{
    class Program
    {
        static void Main(string[] args)
        {

           

            var doc1 = XDocument.Load(@"tanu1.xml");
            var doc2 = XDocument.Load(@"tanu2.xml");


            var dict = doc1.Root.Elements("parent").ToDictionary(el =>
                el.Attribute("children").Value);

            doc2.Root.Elements("parent").ToList().ForEach(el =>
            {
                XElement el2;
                if (dict.TryGetValue(el.Attribute("children").Value, out el2) &&
                    !el.Attributes().Select(a => new { a.Name, a.Value }).Except(
                    el2.Attributes().Select(a => new { a.Name, a.Value })).Any())
                    el.Remove();
            });
            doc2.Save(@"file3.xml");
        }
       
    }
}


it doesnot work well or i think i am somewhere wrong in accepting values as i am not that good coder. 
does any one has alternate to this?