How Do I Import/Export A Xades Signed Xml Document Into/from Another Xml Document?

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C#

ASP.NET

C#4.0

Hi,
I am trying to import a signed xml document into another xml document. When i import the document, and export it with no change, i can no longer validate it.

Even the code below breaks the validation.

OpenFileDialog ofd = new OpenFileDialog();
ofd.ShowDialog();

if (ofd.FileName != "")
{
   XmlDocument XmlDocument = new XmlDocument();
   XmlDocument.Load(ofd.FileName);

   FolderBrowserDialog fbd = new FolderBrowserDialog();
   fbd.ShowDialog();

   if (fbd.SelectedPath != "")
   {
      XmlDocument.Save(fbd.SelectedPath + @"\Doc.xml");
   }
}

How can i import/export an xml document without breaking the validation?