private void button1_Click(object sender, EventArgs e) { string username = TextBoxUsername.Text; string password = TextBoxPassword.Text; var item = ComboBoxParticipants.SelectedItem; if (item == "Committee Member") { CommitteeMember cm = controllerCM.Login(username, password); if (cm.Username == username) //login successful { this.Hide(); FormCommitteeMember secondform = new FormCommitteeMember(cm, this); secondform.Show(); } } else if (item == "Listener") { Listener l = controllerL.Login(username, password); if (l.Username == username) //login successful { this.Hide(); FormListener secondform = new FormListener(l, this); secondform.Show(); } } else if (item == "Speaker") { Speaker s = controllerS.Login(username, password); if (s.Username == username) //login successful { this.Hide(); FormSpeaker secondform = new FormSpeaker(s, this); secondform.Show(); } } }