Csharp/C Sharp by API/System.Globalization/CultureTypes

CultureTypes.AllCultures

using System;
using System.Globalization;
class MainClass
{
  public static void Main() 
  {
    foreach (CultureInfo ci in CultureInfo.GetCultures(CultureTypes.AllCultures))
    {
      Console.WriteLine("{0} | {1}", ci.EnglishName, ci.Name);
    }
  }
}