public IList<Core.Business.Calendar> GetAllCalendar()
        {
            IList<Core.Business.Calendar> calendarlist = new List<Core.Business.Calendar>();
            SqlServerUtility sql = new SqlServerUtility();

            SqlDataReader reader = sql.ExecuteSPReader("usp_SelectCalendarsAll");

            if(reader != null)
            {
                while(reader.Read())
                {
                    Core.Business.Calendar calendar = new Core.Business.Calendar();

                    if (!reader.IsDBNull(0)) calendar.Id = reader.GetGuid(0);
                    if (!reader.IsDBNull(1)) calendar.Name = reader.GetString(1);

                    calendar.MarkOld();
                    calendarlist.Add(calendar);
                }
                reader.Close();
            }
            return calendarlist;
        }