Read XML using Linq

Read XML using Linq

using System.Linq;
using Pdf_Rendering;
using System.IO;
using System.Reflection;
using System.Xml.Linq;
            
XNamespace namespacexml= "http://www.heidelberg.com";
if (Path.GetExtension(fn).ToLower() != ".xml") { Console.WriteLine("Input file not a pdf file"); return false; }
if (!File.Exists(fn)) { Console.WriteLine("Input file does not exist"); return false; }
XDocument doc = XDocument.Load(fn);
IEnumerable<XElement> st = doc.Descendants( namespacexml+ name_descendandts);
foreach (XElement el in st)
{
    Console.WriteLine("El=" + el.ToString()); 
}
return true;