private void btnLuu_Click(object sender, EventArgs e) { try { //enty_sach.MaSach = int.Parse(txtMasach.Text); enty_sach.TenSach = txtTensach.Text; enty_sach.GiaBan = int.Parse(txtGiaban.Text); enty_sach.MaCD = int.Parse(cboMaCD.SelectedValue.ToString()); enty_sach.MaNXB = int.Parse(cboNhaNXB.SelectedValue.ToString()); enty_sach.SoLuong = int.Parse(txtSoluong.Text); enty_sach.NgayNhap = Convert.ToDateTime(txtNgaynhap.Text); enty_sach.MoTa = txtMota.Text; Sach_DAO.Them(enty_sach); dgvDausach.DataSource = Sach_DAO.LoadDuLieu(); } catch (Exception ex) { MessageBox.Show(ex.Message); } }