Get Holidays from Database

I am trying to get a list of holidays from a database to show in ASP:Calender. Nothing shows when I run the calendar. There is data in the database and I tested the connection and it works fine.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace Calender
{
    public partial class Default : System.Web.UI.Page
    {
        private List<DateTime> HolidayDate = new List<DateTime>();
        private List<string> HolidayName = new List<string>();

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                GetHolidays();
            }
        }

        private void GetHolidays()
        {
            SqlConnection conn;
            SqlCommand comm;
            SqlDataReader reader;
            string connectionString = ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;
            conn = new SqlConnection(connectionString);
            comm = new SqlCommand("SELECT * FROM Holidays", conn);
            try
            {
                conn.Open();
                reader = comm.ExecuteReader();
                while (reader.Read())
                {
                    HolidayDate.Add((DateTime)reader[1]);
                    HolidayName.Add((string)reader[2]);
                }
                reader.Close();
            }
            finally
            {
                conn.Close();
            }    
        }

        protected void ApptCal_CalRender(object sender, System.Web.UI.WebControls.DayRenderEventArgs e)
        {
            string tooltipValue = string.Empty;
            if (IsEventDay(e.Day.Date, out tooltipValue))
            {
                e.Cell.BackColor = System.Drawing.Color.DarkGoldenrod;
                e.Cell.ToolTip = tooltipValue;
            }
            if (e.Day.IsWeekend)
            {
                e.Cell.BackColor = System.Drawing.Color.Black;
                e.Cell.ForeColor = System.Drawing.Color.White;
            }

            if (e.Day.IsOtherMonth)
            {
                e.Cell.Text = "";
            }
        }

        private bool IsEventDay(DateTime calenderDay, out string tooltipValue)
        {
            tooltipValue = string.Empty;
            for (int i = 0; i < HolidayDate.Count; i++)
            {
                if (HolidayDate[i] == calenderDay)
                {
                    tooltipValue = HolidayName[i];
                    return true;
                }
            }
            return false;
        }
        protected void ApptCal_VisibleMonthChanged(object sender, MonthChangedEventArgs e)
        {
            GetHolidays();
        }
    }
}

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        <asp:Calendar ID="ApptCal" Width="750px" FirstDayOfWeek="Sunday" OnVisibleMonthChanged="ApptCal_VisibleMonthChanged" DayNameFormat="Short" OnDayRender="ApptCal_CalRender" NextPrevFormat="ShortMonth" SelectedDayStyle-BackColor="SkyBlue" TodayDayStyle-BackColor="Yellow"  
        BorderWidth="2px" 
        Font-Names="Arial" 
        Font-Size="Medium" 
        ShowGridLines="true" 
        DayStyle-Height="48px" 
        DayStyle-Width="125px" 
        DayStyle-Wrap="true" 
        runat="server"/>

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