System.Data.XmlToDatasetMap.BuildIdentityMap C# (CSharp) Method

        private void BuildIdentityMap(XmlNameTable nameTable, DataTable dataTable)
        {
            ArrayList tableList = GetSelfAndDescendants(dataTable);     // Get list of tables we're loading
                                                                        // This includes our table and 
                                                                        // related tables tree

            _tableSchemaMap = new XmlNodeIdHashtable(tableList.Count);
            // Create hash table to hold all
            // tables to load.

            foreach (DataTable t in tableList)
            {                        // For each table
                TableSchemaInfo tableSchemaInfo = AddTableSchema(nameTable, t);
                // Create schema info
                if (tableSchemaInfo != null)
                {
                    foreach (DataColumn c in t.Columns)
                    {              // Add column information
                        // don't include auto-generated PK, FK and any hidden columns to be part of mapping
                        if (IsMappedColumn(c))
                        {
                            AddColumnSchema(nameTable, c, tableSchemaInfo.ColumnsSchemaMap);
                        }
                    }

                    foreach (DataRelation r in t.ChildRelations)
                    {     // Add nested tables information
                        if (r.Nested)
                        {                                 // Is it nested?
                            // don't include non nested tables

                            // Handle namespaces and names as usuall

                            string _tableLocalName = XmlConvert.EncodeLocalName(r.ChildTable.TableName);
                            string tableLocalName = nameTable.Get(_tableLocalName);

                            if (tableLocalName == null)
                            {
                                tableLocalName = nameTable.Add(_tableLocalName);
                            }

                            string tableNamespace = nameTable.Get(r.ChildTable.Namespace);

                            if (tableNamespace == null)
                            {
                                tableNamespace = nameTable.Add(r.ChildTable.Namespace);
                            }

                            XmlNodeIdentety idTable = new XmlNodeIdentety(tableLocalName, tableNamespace);
                            tableSchemaInfo.ColumnsSchemaMap[idTable] = r.ChildTable;
                        }
                    }
                }
            }
        }