System.Data.ForeignKeyConstraint.CascadeRollback C# (CSharp) Method

        internal void CascadeRollback(DataRow row)
        {
            Index childIndex = _childKey.GetSortIndex(row.RowState == DataRowState.Deleted ? DataViewRowState.OriginalRows : DataViewRowState.CurrentRows);
            object[] key = row.GetKeyValues(_parentKey, row.RowState == DataRowState.Modified ? DataRowVersion.Current : DataRowVersion.Default);

            if (IsKeyNull(key))
            {
                return;
            }

            Range range = childIndex.FindRecords(key);
            if (_acceptRejectRule == AcceptRejectRule.Cascade)
            {
                if (!range.IsNull)
                {
                    DataRow[] rows = childIndex.GetRows(range);
                    for (int j = 0; j < rows.Length; j++)
                    {
                        if (rows[j]._inCascade)
                            continue;
                        rows[j].RejectChanges();
                    }
                }
            }
            else
            {
                // AcceptRejectRule.None
                if (row.RowState != DataRowState.Deleted && row.Table.DataSet.EnforceConstraints)
                {
                    if (!range.IsNull)
                    {
                        if (range.Count == 1 && childIndex.GetRow(range.Min) == row)
                            return;

                        if (row.HasKeyChanged(_parentKey))
                        {// if key is not changed, this will not cause child to be stranded
                            throw ExceptionBuilder.FailedCascadeUpdate(ConstraintName);
                        }
                    }
                }
            }
        }