lw_common.ui.note_ctrl.curNote_KeyDown C# (CSharp) Method

        private void curNote_KeyDown(object sender, KeyEventArgs e) {
            string s = util.key_to_action(e);
            if (s == "return") {
                // add note
                string note_text = curNote.Text.Trim();
                if (note_text == "")
                    return;
                // see if I'm on a user's note (thus, i'm updating), or on a line (thus, i'm adding a note for that line)
                string reply_to_note_id = "";
                int sel = notesCtrl.SelectedIndex;
                if (sel >= 0) {
                    var i = notesCtrl.GetItem(sel).RowObject as note_item;
                    bool is_edit = i.the_note != null && i.the_note.author_name == author_name_;
                    if (is_edit) {
                        dirty_ = true;
                        i.the_note.note_text = note_text;
                        // user modified the note
                        i.utc_last_edited = DateTime.UtcNow;
                        refresh_note(i);
                        return;
                    }
                    bool is_reply = i.the_note != null && i.the_note.author_name != author_name_;
                    if (is_reply)
                        reply_to_note_id = i.note_id;
                }

                note new_ = new note() { author_name = author_name_, author_initials = author_initials_, 
                    author_color = author_color_, note_text = note_text, made_by_current_user = true, is_new = true };
                add_note(new_, "", reply_to_note_id, false, DateTime.UtcNow);
                refresh_notes();
            }
        }