This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature.
The FirstRow property is an ordinal value that defines the starting point for a bulk data copy.
When data is copied from SQL Server using the ExportData method of a Table or View object, the FirstRow property indicates the starting row position in the SQL Server table. When data is copied to SQL Server using the ImportData method of a Table object, the FirstRow property indicates the starting row position in the source data file.