private void comboBox3_SelectedIndexChanged(object sender, EventArgs e) { textBox20.Clear(); textBox14.Clear(); textBox2.Clear(); if (comboBox3.Text != "Select Doctor") { PlaceAppointmentmysql doctorinfo = new PlaceAppointmentmysql(); List <string> doctor = doctorinfo.findDoctorInformation(comboBox3.Text); try { textBox20.Text = doctor[0]; textBox14.Text = doctor[1]; textBox2.Text = doctor[2]; } catch (Exception) { textBox20.Clear(); textBox14.Clear(); textBox2.Clear(); } } }