System.Globalization.CultureTable.IsValidLcid C# (CSharp) Method

        private static bool IsValidLcid(int lcid, bool canBeCustomLcid)
        {
            if (canBeCustomLcid && CultureTableRecord.IsCustomCultureId(lcid))
                return true;
            
            if (CultureTable.Default.IsExistingCulture(lcid))
                return true;


            return false;
        }