I just published a new article titled "Using ADO.Net SQL Bulk Copy feature".
It is fascinating how this small class can copy a large number of rows quickly. So if you are using Microsoft SQL Server and want to copy rows from your application to a database table, be sure to read this article.
The article is available at http://www.emoreau.com/Entries/Articles/2010/12/Using-ADONet-SQL-Bulk-Copy-feature.aspx.