public void Delete()
        {
            List <SubnodeLeafBlock> leaves = GetLeafBlocks();

            foreach (SubnodeLeafBlock leaf in leaves)
            {
                foreach (SubnodeLeafEntry entry in leaf.rgentries)
                {
                    Subnode subnode = Subnode.GetSubnode(this.File, entry);
                    subnode.Delete();
                }
                DeleteBlock(leaf);
            }

            // we could have already deleted our root block (if it's a leaf)
            if (m_rootBlock is SubnodeIntermediateBlock)
            {
                DeleteBlock(m_rootBlock);
            }
            m_rootBlock = null;

            SaveChanges();
        }
        /// <summary>
        /// Add column to an empty table context.
        /// If this is a Contents Table, the caller should call UpdateMessage() afterwards.
        /// Similarly, for attachment table, the caller should call UpdateAttachment().
        /// </summary>
        public void AddPropertyColumn(PropertyID propertyID, PropertyTypeName propertyType)
        {
            TableColumnDescriptor newColumnDescriptor = new TableColumnDescriptor();

            newColumnDescriptor.PropertyID   = propertyID;
            newColumnDescriptor.PropertyType = propertyType;
            newColumnDescriptor.iBit         = (byte)m_tcInfo.ColumnCount;
            newColumnDescriptor.cbData       = (byte)GetPropertyDataLength(propertyType);

            // Set the ibData:
            // http://social.msdn.microsoft.com/Forums/en-US/os_binaryfile/thread/a5f9c653-40f5-4638-85d3-00c54607d984/
            // PidTagLtpRowId and PidTagLtpRowVer must not be relocated
            if (newColumnDescriptor.DataLengthGroup == TableContextInfo.TCI_4b)
            {
                newColumnDescriptor.ibData = m_tcInfo.rgib[TableContextInfo.TCI_4b];
            }
            else if (newColumnDescriptor.DataLengthGroup == TableContextInfo.TCI_2b)
            {
                newColumnDescriptor.ibData = m_tcInfo.rgib[TableContextInfo.TCI_2b];
            }
            else
            {
                newColumnDescriptor.ibData = m_tcInfo.rgib[TableContextInfo.TCI_1b];
            }

            // We call GetRedistributedRows() before adding the new column:
            List <byte[]> rows = GetRedistributedRows(newColumnDescriptor.ibData, newColumnDescriptor.cbData);

            // add the new column
            m_tcInfo.rgTCOLDESC.Add(newColumnDescriptor);

            // redistribute column descriptions
            ushort offset = (ushort)(newColumnDescriptor.ibData + newColumnDescriptor.cbData);

            for (int groupIndex = newColumnDescriptor.DataLengthGroup + 1; groupIndex < 3; groupIndex++)
            {
                for (int index = 0; index < m_tcInfo.rgTCOLDESC.Count; index++)
                {
                    TableColumnDescriptor descriptor = m_tcInfo.rgTCOLDESC[index];

                    if (groupIndex == descriptor.DataLengthGroup)
                    {
                        // changes to descriptor will be saved when calling UpdateTableContextInfo()
                        descriptor.ibData = offset;
                        offset           += descriptor.cbData;
                    }
                }
            }

            // update the group ending offset
            m_tcInfo.UpdateDataLayout();
            m_rowsPerBlock = (int)Math.Floor((double)DataBlock.MaximumDataLength / RowLength);

            // Update the rows data
            if (!m_tcInfo.hnidRows.IsEmpty)
            {
                if (m_tcInfo.hnidRows.IsHeapID)
                {
                    m_heap.RemoveItemFromHeap(m_tcInfo.hnidRows.HeapID);
                    CreateSubnodeForRows();
                }
                else
                {
                    if (m_subnodeRows == null)
                    {
                        m_subnodeRows = m_subnodeBTree.GetSubnode(m_tcInfo.hnidRows.NodeID);
                    }
                    m_subnodeRows.Delete(); // this will set the subnode data-tree to null
                    // New data tree will be created when the first row will be added
                    m_subnodeBTree.UpdateSubnodeEntry(m_tcInfo.hnidRows.NodeID, null, null);
                }

                for (int index = 0; index < rows.Count; index++)
                {
                    AddRowToSubnode(index, rows[index]);
                }
            }

            UpdateTableContextInfo();
        }