private void btnAdd_Click(object sender, EventArgs e) { // lstMeetingNotes.BeginUpdate(); CAMR_3.Business.Meeting meeting = new CAMR_3.Business.Meeting(); meeting.MeetingDate = txtDate.Text; ac.uk.brunel.contextaware.Note note1 = new ac.uk.brunel.contextaware.Note(); note1.message = "abc"; ac.uk.brunel.contextaware.Note note2 = new ac.uk.brunel.contextaware.Note(); note2.message = "def"; meeting.AddNote(note1); meeting.AddNote(note2); meetings.Add(meeting); // lstMeetingNotes.EndUpdate(); lstMeetingNotes.Items.Add(meeting); //lstMeetingNotes.DataSource = meetings; }