public string CheckRedundantEmployee(Employee emp)
    {
        string msg = " ";
        Date dt = new Date();
        DateTime end_date = dt.getDateFromSAPToSQL(emp.EndDate);
        DateTime last_date_month = dt.getEndPeriodDate(month, year);

        if ((DateTime.Now > end_date) && (end_date.Day < last_date_month.Day)) msg = "<br><span class='redundant'>(������ � " + end_date.AddDays(1).ToString("d") + ")</span>";

        return msg;
    }