How do you refresh data bound to a DataGridView

This should be easy... but I don't know how to do it.

I have created a DataSet that is bound to a DataGridView so that the DataGridView displays the data in my DataSet.  If my DataGridView is called dgvStudents, the following code DOES NOT do the job:

dgvStudents.Refresh();

I can see the grid itself flash and refresh(), but the data behind the grid is not being refreshed, so new items in the database (added by another process) are not being displayed in the grid.

How do you do this?