private void BtHoanTat_Click(object sender, EventArgs e) { DateTime now = DateTime.Today; if (now.Year - Convert.ToInt32(txtNamXuatBan.Text) > Convert.ToInt32(txtGioiHanXuatBan.Text)) { MessageBox.Show("Sách quá cũ!", "Thông báo", MessageBoxButtons.OK, MessageBoxIcon.Information); } else { dl.LayGioiHanXuatBan = Convert.ToInt32(txtGioiHanXuatBan.Text); dl.ID_TheLoaiSach = Convert.ToInt32(cboTheLoaiSach.SelectedValue.ToString()); dl.ID_TacGia = Convert.ToInt32(cboTacGia.SelectedValue.ToString()); //dl.ID_NXB = txtNhaXuatBan; dl.Ten_Sach = txtTenSach.Text; dl.Gia = Convert.ToInt32(txtTriGia.Text); dl.Sl_Nhap = 0; dl.MoTa = txtMoTa.Text; dl.NamXuatBan = Convert.ToInt32(txtNamXuatBan.Text); dl.NgayNhap = Convert.ToDateTime(dtpNgayNhap.Text); dl.TrangThai_Sach = ""; dl.TrangThai_MuonSach = ""; xldl.Sach_INSERT(dl); dtgSach.DataSource = xldl.Sach_Select(dl); } }