// GET: Sach
public ActionResult GetAllBook(int?page = 1)
{
int total = 0;
int endAt = (int)page * pageSize;
int fromAt = endAt - pageSize;
var list = sachService.GetAllBook((int)fromAt, pageSize, ref total);
ViewBag.Pager = Pager.Items(total).PerPage(pageSize).Move((int)page).Segment(5).Center();
return(View(list));
}