using System;

using System.Collections.Generic;

using System.Globalization;

using System.Linq;

using System.Threading;

​

public class Program

{

    public static void Main()

    {

        Example1();

        Example2();

    }

    public static void Example2()

    {

            var supportedCultures = GetCultures();

            var cultures = 

                CultureInfo.GetCultures(CultureTypes.AllCultures)

                    .Where(w => supportedCultures.ContainsKey(w.TextInfo.CultureName))

                    .Select(a => new

                    {

                        text = a.DisplayName,

                        value = a.TextInfo.CultureName,

                        selected = string.Equals(a.TextInfo.CultureName, Thread.CurrentThread.CurrentCulture.TextInfo.CultureName,

                            StringComparison.InvariantCultureIgnoreCase)

                    });

​

            cultures.ToList().ForEach(i => Console.WriteLine(i.ToString()));

    }

    public static void Example1()

    {

        var culture = "";

        var currentCulture = new CultureInfo(culture);

​

        var cultureInfos = CultureInfo.GetCultures(currentCulture.CultureTypes);

​

        if (cultureInfos.All(c => c.Name != "")) 

        {

            //Invariant Culture was not found. Adding it.

            cultureInfos = cultureInfos.Append(CultureInfo.InvariantCulture).ToArray();

        }

​

        var filteredCultures = cultureInfos

            .Where(x => x.Name == "en-US" || x.Name == "en-GB" || x.Name == "de-DE" || x.Name == "fr-FR" || x.Name == "")

            .ToDictionary(x => x.Name, x => (x.Name == "" ? "" : x.EnglishName));

​

        filteredCultures.ToList().ForEach(i => Console.WriteLine(i.ToString()));

    }

    public static Dictionary<string, string> GetCultures(string culture = "")

        {

            var currentCulture = new CultureInfo(culture);

​

            var cultureInfos = CultureInfo.GetCultures(currentCulture.CultureTypes);

​

            if (cultureInfos.All(c => c.Name != "")) 

            {

                //Invariant Culture was not found. Adding it.

                cultureInfos = cultureInfos.Append(CultureInfo.InvariantCulture).ToArray();

            }

            var filteredCultures = cultureInfos

                .Where(x => x.Name == "en-US" || x.Name == "en-GB" || x.Name == "de-DE" || x.Name == "fr-FR" || x.Name == "")

                .ToDictionary(x => x.Name, x => (x.Name == "" ? "" : x.EnglishName));

​

            return filteredCultures;

        }

}