public void TimeSlotlist() { //comboBoxslots.Items.Clear(); DatabaseOps databaseOps = new DatabaseOps(); comboBoxslots.DataSource = databaseOps.timeslotlist(Convert.ToInt32(comboBoxDoctor.SelectedValue.ToString()));; comboBoxslots.DisplayMember = "slotdec"; comboBoxslots.ValueMember = "id"; }