private int _cuckooHash(TKey key, int whichHashFunction)
        {
            if (whichHashFunction <= 0 || whichHashFunction > _universalHashingFamily.NumberOfFunctions)
                throw new ArgumentOutOfRangeException("Which Hash Function parameter must be betwwen 1 and " + NUMBER_OF_HASH_FUNCTIONS + ".");

            int hashCode = Math.Abs(_universalHashingFamily.UniversalHash(_equalityComparer.GetHashCode(key), whichHashFunction));

            return hashCode % _collection.Length;
        }