Oh, you should use the GridViewUpdateEventArgs:

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
 {
productTableAdapter pAdapter = new productTableAdapter();
int id = Convert.ToInt32(e.OldValues["id"]);
string name = e.NewValues["name"].ToString();
string desc = e.NewValues["description"].ToString();
 
pAdapter.Update(id, name, description);
 
GridView1.EditIndex = -1;
 
GridView1.DataBind();
    }