private void button3_Click(object sender, EventArgs e) { Boolean validConf = false; if (listBox1.SelectedIndex == -1) { MessageBox.Show("Please Choose a conference to enter"); } else { validConf = Program.MainSystem.validateConference(SearchResults[listBox1.SelectedIndex]); if (validConf) { currentCon = SearchResults[listBox1.SelectedIndex]; currentCon.Participant.Add(Program.MainSystem.LoggedIn); currentCon.Participant = currentCon.Participant.Distinct().ToList(); ConferenceForm startConference = new ConferenceForm(currentCon); startConference.Show(); } else { MessageBox.Show("You do not have the skills to enter this conference"); } } }