มีวิธีที่จะเน้นสีวันที่บน MonthCalendar ไหมครับ [C# winapp]

void queryAlertDay()
        {
            string sql_cmd = @"SELECT alert.date_alert FROM alert";

            MySqlConnection MyConn = new MySqlConnection(Properties.Settings.Default.myConnection);
            MySqlCommand cmd = new MySqlCommand(sql_cmd, MyConn);
            MySqlDataReader myReader;
            MyConn.Open();
            myReader = cmd.ExecuteReader();
            while(myReader.Read() == true)
            {
                string a = myReader.GetDateTime(0).ToString("MM/dd/yyyy");
                addArray(a);
            }
            hl_date();
        }

        DateTime[] absentDates = new DateTime[365];
        ArrayList myArray = new ArrayList();

        void addArray(string d)
        {
            myArray.Add(d);
        }

        void hl_date()
        {
            for (int i = 0; i < myArray.Count; i++)
            {
                absentDates[i] = Convert.ToDateTime(myArray[i]);
            }
            monthCalendar1.BoldedDates = absentDates;
        }