Bulk Copy Operations in SQL Server
Microsoft SQL Server includes a popular command-line utility named bcp for quickly bulk copying large files into tables or views in SQL Server databases. The SqlBulkCopy class allows you to write managed code solutions that provide similar functionality. There are other ways to load data into a SQL Server table (INSERT statements, for example) but SqlBulkCopy offers a significant performance advantage over them.
The SqlBulkCopy class can be used to write data only to SQL Server tables. But the data source is not limited to SQL Server; any data source can be used, as long as the data can be loaded to a DataTable instance or read with a IDataReader instance.
Using the SqlBulkCopy class, you can perform:
A single bulk copy operation
Multiple bulk copy operations
A bulk copy operation within a transaction