public bool ThemNhapSach(Sach sach) { sach.MaSach = objSach.GetMaSach(sach.TenSach, sach.TenTacGia).Rows[0]["masach"].ToString(); string ngaynhap = DateTime.Today.Month.ToString() + "/" + DateTime.Today.Day.ToString() + "/" + DateTime.Today.Year.ToString(); if (objSach.KiemTraNhapSach(ngaynhap, sach.MaSach) == true) { return(objSach.InsertNhapSach(sach)); } else { return(objSach.CapNhatNhapSach(sach)); } }