private void btnThem_Click(object sender, EventArgs e) { if (kiemtra()) { dtpNgayGio.Format = DateTimePickerFormat.Custom; dtpNgayGio.CustomFormat = "dd/MM/yyyy h:mm:ss"; cttpBUS = new ChiTietThuePhongBUS(); cttpDT0 = new ChiTietThuePhongDTO(); cttpDT0.Maphieuthue = cmbMaPT.SelectedItem.ToString(); cttpDT0.Maphong = cmbMaphong.SelectedItem.ToString(); cttpDT0.Ngay = DateTime.Parse(dtpNgayGio.Value.ToString()); cttpDT0.Madichvu = cmbMaDV.SelectedValue.ToString(); cttpDT0.Soluong = (int)numSL.Value; if (cttpBUS.insertChiTietThuePhong(cttpDT0) == 1) { show_CTTP(); } else { MessageBox.Show("Lỗi thêm dữ liệu!", "Thông báo", MessageBoxButtons.OK, MessageBoxIcon.Warning); dtpNgayGio.Value = DateTime.Now; } } }