关于calendar的简单问题

我做了一个。。不过刚开始就有错误。请指教一下
aspx:
 <asp:calendar id="Calendar1" CellPadding="2" Width="160px" TitleStyle-BackColor="#000000" BorderColor="#aaaaaa" 
DayHeaderStyle-BackColor="#5e715e" OtherMonthDayStyle-ForeColor="#cccccc" DayNameFormat="Full" 
OnPreRender="Calendar1_PreRender" OnDayRender="Calendar1_DayRender"
runat="server" TitleStyle-ForeColor="#ffffff" NextPrevStyle-ForeColor="#ffffff" CellSpacing="1" 
WeekendDayStyle-BackColor="#eeeeee" DayHeaderStyle-ForeColor="#ffffff" SelectionMode="None" 
TodayDayStyle-BorderColor="#5e715e" TodayDayStyle-BorderWidth="1" TodayDayStyle-Font-Bold="true" 
TodayDayStyle-ForeColor="#5e715e"/>cs:
    private void Calendar1_PreRender(object sender, System.EventArgs e)
    {
     
    }
    protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
    {
    }错误提示 CS0122: 'blog_Public_Left.Calendar1_PreRender(object, System.EventArgs)' is inaccessible due to its protection levelSource Error: 
Line 354:          <asp:calendar id="Calendar1" CellPadding="2" Width="160px" TitleStyle-