System Globalization C# by API

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Resources;
using System.Text;
using System.Threading;
using System.Globalization;
public class MainClass
{
    public static void Main()
    {
       string[] cultures = new string[] { "en-US", "en-GB", "es-MX", "de-DE", "ja-JP" };
        using (TextWriter sw = Console.Out)
        {
            foreach (string c in cultures)
            {
                CultureInfo ci = new CultureInfo(c);
                sw.Write("    Calendars: ");
                sw.Write("      {0} (primary)", ci.Calendar.GetType().Name);
                foreach (Calendar cal in ci.OptionalCalendars)
                    sw.Write(", {0}", cal.GetType().Name);
                sw.WriteLine();
            }
        }
    }
}