private void btnQuery_Click(object sender, EventArgs e) { if (String.IsNullOrEmpty(cmbWhereFrom.Text) && String.IsNullOrEmpty(cmbWhereTo.Text)) { MessageBox.Show("Kalkış noktası ile varış noktası boş bırakılamaz"); } else { pnlTimeSeat.Visible = true; } lblWhereFrom.Text = cmbWhereFrom.Text; lblWhereTo.Text = cmbWhereTo.Text; string travelDate = dtpTravelDate.Value.ToString(); lblTravelDate.Text = travelDate.Substring(0, 10); cmbTravelTime.Items.Clear(); var times = bbo.GetListByDate(lblWhereFrom.Text, lblWhereTo.Text, Convert.ToDateTime(lblTravelDate.Text)); foreach (var item in times) { SelectedBusId = item.Id; string time = item.TravelTime.ToString(); time = time.Substring(0, 5); cmbTravelTime.Items.Add(time); } }