System.Data.DataRow.BeginEditInternal C# (CSharp) Method

        private bool BeginEditInternal()
        {
            if (_inChangingEvent)
            {
                throw ExceptionBuilder.BeginEditInRowChanging();
            }
            if (_tempRecord != -1)
            {
                if (_tempRecord < _table._recordManager.LastFreeRecord)
                {
                    return false; // we will not call EndEdit
                }
                else
                {
                    // partial fix for detached row after Table.Clear scenario
                    // in debug, it will have asserted earlier, but with this
                    // it will go get a new record for editing
                    _tempRecord = -1;
                }
                // shifted VerifyRecord to first make the correction, then verify
                _table._recordManager.VerifyRecord(_tempRecord, this);
            }

            if (_oldRecord != -1 && _newRecord == -1)
            {
                throw ExceptionBuilder.DeletedRowInaccessible();
            }

            ResetLastChangedColumn(); // shouldn't have to do this

            _tempRecord = _table.NewRecord(_newRecord);
            Debug.Assert(-1 != _tempRecord, "missing temp record");
            Debug.Assert(0 == _countColumnChange, "unexpected column change count");
            Debug.Assert(null == _lastChangedColumn, "unexpected last column change");
            return true;
        }