The already open SAConnection that will be used to perform the bulk-copy operation. If the connection is not open,
an exception is thrown in WriteToServer.
A combination of values from the SABulkCopyOptions enumeration that determines which data source rows are copied to
the destination table.
An existing SATransaction instance under which the bulk copy will occur. If externalTransaction is not NULL, then
the bulk-copy operation is done within it. It is an error to specify both an external transaction and the UseInternalTransaction