gathering all data which user has entered in a datatable, now wanna to save them in DB. How?

Question

Hi I have a webform which has a gridview. the gridview (gridView1) has been bound to a datatable (dataTable1).

when user creates a new row, I add that new row to the dataTable1. Also, when he updates a specific row within gridView1, I update dataTable1.

Now, I want to save all rows within dataTable1 in DB. How?