error in code............

<asp:Calendar ID="Calendar1" runat="server" OnDayRender="CalenderDRender" BackColor="White" BorderColor="White" BorderWidth="1px" Font-Names="Verdana" Font-Size="9pt" ForeColor="Black" Height="190px" NextPrevFormat="FullMonth" Width="350px" OnSelectionChanged="Calendar1_SelectionChanged">
           <SelectedDayStyle BackColor="#333399" ForeColor="White" />
           <TodayDayStyle BackColor="#CCCCCC" />
           <OtherMonthDayStyle ForeColor="#999999" />
           <NextPrevStyle Font-Bold="True" Font-Size="8pt" ForeColor="#333333" VerticalAlign="Bottom" />
           <DayHeaderStyle Font-Bold="True" Font-Size="8pt" />
           <TitleStyle BackColor="White" BorderColor="Black" BorderWidth="4px" Font-Bold="True"
               Font-Size="12pt" ForeColor="#333399" />
       </asp:Calendar>

'ASP.default2_aspx' does not contain a definition for 'CalenderDRender'

protected void CalendarDRender(object sender, System.Web.UI.WebControls.DayRenderEventArgs e)
    {
        // If the month is CurrentMonth
        if (!e.Day.IsOtherMonth)
        {
            foreach (DataRow dr in ds.Tables[0].Rows)
            {
                if ((dr["EventDate"].ToString() != DBNull.Value.ToString()))
                {
                    DateTime dtEvent = (DateTime)dr["EventDate"];
                    if (dtEvent.Equals(e.Day.Date))
                    {
                        e.Cell.BackColor = Color.PaleVioletRed;
                    }
                }
            }
        }
        //If the month is not CurrentMonth then hide the Dates
        else
        {
            e.Cell.Text = "";
        }
    }