For #23

ORDER ( { column [ ASC | DESC ] } [ ,... n ] ) Specifies how the data in the data file is sorted. Bulk import performance is improved if the data being imported is sorted according to the clustered index on the table, if any. If the data file is sorted in a different order, that is other than the order of a clustered index key or if there is no clustered index on the table, the ORDER clause is ignored. The column names supplied must be valid column names in the destination table. By default, the bulk insert operation assumes the data file is unordered. For optimized bulk import, SQL Server also validates that the imported data is sorted.

insert bulk, which SqlBulkCopy uses, will return an error message when an ORDER hint is given for an identity column and the query is not executed. This differs from BULK INSERT, which ignores the ORDER hint but still executes the query.