DeSerialize XML file with namespaces

Given the following XML file, I wanted to iterate over all of the records and summarize the values of all elements named HANDLED.
Each LANGUAGE has 12 records so I wanted a summary for each language and then spit it out into a .csv file.

    TELEPHONE__2011-01-26.XML
    345
    
        1
        SWE
        12
        1
        4533
        2400
        6292
        204
        2196
    

I got nice exceptions occurring because of the namespace prefix when I first tried the following code:

var stats = from stat in xd.Descendants("CRP:PHONE_STATISTICS")
    where stat.Element("LANGUAGE").Value == language
    select new
    {
        Handled = int.Parse(stat.Element("HANDLED").Value),
        Abandoned = int.Parse(stat.Element("ABANDONED").Value),
        Language = stat.Element("LANGUAGE").Value
    };

So I then found out that I could prefix the element names with the actual namespace provided in the root element of the document, like this:

XNamespace ns = "http://somedomain/CR/PHONE";

var stats = from stat in xd.Descendants(ns + "PHONE_STATISTICS")

The end result looks like this:

namespace XMLSummarizer
{
    class Program
    {   
        static void Main(string[] args)
        {
            XNamespace ns = "http://somedomain/CR/PHONE";

            string txtLogFileName = @"data.csv";
            string XMLfolder = Directory.GetCurrentDirectory();

            TextWriter tw = new StreamWriter(txtLogFileName);

            tw.WriteLine("Date;Month;Handled;Abandoned;Language");
            
            foreach (var file in System.IO.Directory.EnumerateFiles(XMLfolder,"*.xml"))
            {
                DateTime statsDate = DateTime.Parse(file.Substring(file.IndexOf("_PHONE") + 7, 10));
                Console.WriteLine(statsDate.ToShortDateString());

                XDocument xd = XDocument.Load(file);

                string[] languages = new string[] { "SWE", "DAN", "NOR", "FIN" };

                foreach (string language in languages)
                {
                    SummarizeDataPerDay(ns, tw, xd, language, statsDate);
                }
            }
            
            tw.Flush();
            tw.Close();

            Console.WriteLine("Operation completed successfully. Press [Enter] to close application.");
            Console.ReadLine();
        }
        
        private static void SummarizeDataPerDay(XNamespace ns, TextWriter tw, XDocument xd, string language, DateTime dataDate)
        {
            var stats = from stat in xd.Descendants(ns + "PHONE_STATISTICS")
                        where stat.Element("LANGUAGE").Value == language
                        select new
                        {
                            Handled = int.Parse(stat.Element("HANDLED").Value),
                            Abandoned = int.Parse(stat.Element("ABANDONED").Value),
                            Language = stat.Element("LANGUAGE").Value
                        };

            string lang = "";
            int handledCalls = 0;
            int abandonedCalls = 0;

            foreach (var stat in stats)
            {
                handledCalls += stat.Handled;
                abandonedCalls += stat.Abandoned;
                lang = stat.Language;
            }

            tw.WriteLine(dataDate + ";" + dataDate.Month + ";" + handledCalls + ";" + abandonedCalls + ";" + lang);
        }
    }
}