System.Data.Common.DataStorage.CompareBits C# (CSharp) Méthode

        protected int CompareBits(int recordNo1, int recordNo2)
        {
            bool recordNo1Null = _dbNullBits.Get(recordNo1);
            bool recordNo2Null = _dbNullBits.Get(recordNo2);
            if (recordNo1Null ^ recordNo2Null)
            {
                if (recordNo1Null)
                    return -1;
                else
                    return 1;
            }

            return 0;
        }