public enum Enum1{
        Yes,
        No
    }

    public static class EnumExtension
    {
        public static string Translate(this Enum1 arg)
        {
            switch (arg)
            {
                case Enum1.Yes:
                {
                    return "Tak";
                }
                case Enum1.No:
                {
                    return "Nie";
                }
                default:
                    throw new NotImplementedException();
            }
        }
    }