I saw in an application the ability to have a user type a part of a
name in a textbox, and as they type, a datagridview shows a list of all
customers whose name contains what is typed in the textbox.  This is
all done in real-time without having to require the user to press a
search button.

How would i replicate such functionality?  I assume that it's querying
a database as the user types, and requerying each time they type/delete
a character in the textbox?  Or it could be that the datasource is an
object collection that it's querying from?

Any ideas?  Thanks!