DeserializeXMLToImage.cs

/// <summary>
/// Deserialize the unsigned xml document and retrieve the image
/// </summary>
/// <param name="xmlDocument">Unsigned XmlDocument</param>
/// <returns>Byte[] of the image</returns>
private static byte[] DeserializeXMLToImage(XmlDocument xmlDocument)
{
    StringWriter stringWriter = new StringWriter();
    XmlTextWriter xmlTextWriter = new XmlTextWriter(stringWriter);

    // Save Xml Document to Text Writter.
    xmlDocument.WriteTo(xmlTextWriter);
    UTF8Encoding encoding = new UTF8Encoding();

    // Convert Xml Document To Byte Array.
    byte[] xmlDocumentBuffer = encoding.GetBytes(stringWriter.ToString());

    XmlSerializer mySerializer = new XmlSerializer(typeof(byte[]));

    using (MemoryStream myFileStream = new MemoryStream(xmlDocumentBuffer))
    {
        return (byte[])mySerializer.Deserialize(myFileStream);
    }
}