private void btnAdd_Click(object sender, EventArgs e)
        {
            EditTripForm fm = new EditTripForm(new TripRecord(), true);

            if (fm.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                FillGrid();
            }
        }
        private void btnEdit_Click(object sender, EventArgs e)
        {
            TripRecord trip = new TripRecord();

            trip.userID     = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();
            trip.name       = dataGridView1.SelectedRows[0].Cells[1].Value.ToString();
            trip.arriveTime = Convert.ToDateTime(dataGridView1.SelectedRows[0].Cells[2].Value.ToString());
            trip.memo       = dataGridView1.SelectedRows[0].Cells[3].Value.ToString();

            EditTripForm fm = new EditTripForm(trip, false);

            if (fm.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                FillGrid();
            }
        }