If you're talking about your DataTable being updated when you update the database then you shouldn;t have to. You're supposed to update the DataTable first and then save the changes from there to the database, not the other way around.

If you're talking about your DataTable being updated when some other client updates the database then, generally speaking you can't. If you want data from the database then you have to ask for it. It's not going to send it to you uninvited.