private void btnStartStop_Click(object sender, EventArgs e) { //Enable the stop button btnStopClock.Enabled = true; btnStartClock.Enabled = false; //Determine which rdo is checked if (rdoDigital.Checked == true) { //Hide the other clock analogClock1.Visible = false; //Instantiate a digital clock. clock = new DigitalClock(lblDigiTime, timer1); clock.Show(); clock.On(); } else { //Hide the other clock lblDigiTime.Visible = false; //Instantiate an Analog clock. clock = new AnalogClock(analogClock1, timer1); clock.Show(); clock.On(); } }