private void AddBtn_Click(object sender, EventArgs e) { if (NoteMap == null) { return; } MapNoteDetails dlg = new MapNoteDetails { MapNoteItem = new MapNoteItem() { KeyName = "New Note Map", TriggerNoteNumber = 64, OutputNoteNumber = 64 } }; if (dlg.ShowDialog(this) == DialogResult.OK) { if (NoteMap.Contains(dlg.MapNoteItem.TriggerNoteNumber)) { NoteMap.Remove(NoteMap[dlg.MapNoteItem.TriggerNoteNumber]); } NoteMap.Add(dlg.MapNoteItem); FillList(); } }