private void btnRemove_Click(object sender, EventArgs e) { Class.XuLyThuVien KiemTra = new Class.XuLyThuVien(); if (stt != "") { KiemTra.Plus_SoLuongSach(KiemTra.LayMaSach_TempView(Convert.ToInt32(stt))); KiemTra.RemoveSach_DgvTemp(Convert.ToInt32(stt)); GridViewSachMuon.DataSource = KiemTra.InfoSach_DgvTemp(); //reset stt; stt = ""; txtRemoveBook.Clear(); } else { MetroFramework.MetroMessageBox.Show(this, "Chưa Chọn Dòng Cần Xoá", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } }