System.Collections.SortedList.SortedListEnumerator.MoveNext C# (CSharp) Method

            public virtual bool MoveNext()
            {
                if (_version != _sortedList._version) throw new InvalidOperationException(SR.InvalidOperation_EnumFailedVersion);
                if (_index < _endIndex)
                {
                    _key = _sortedList._keys[_index];
                    _value = _sortedList._values[_index];
                    _index++;
                    _current = true;
                    return true;
                }
                _key = null;
                _value = null;
                _current = false;
                return false;
            }