asp.net - How to select random dates from a Calendar

How to select random dates in Calendar control
SelectRandomDatesInCalendar.aspx

<%@ Page Language="C#" AutoEventWireup="true" %>

<!DOCTYPE html>

<script runat="server">
    protected void Calendar1_SelectionChanged(object sender, System.EventArgs e)
    {
        ListItem li = new ListItem();
        li.Text = Calendar1.SelectedDate.ToShortDateString();
        BulletedList1.Items.Add(li);
        
        Calendar1.SelectedDates.Clear();
        SelectedDatesCollection dates = Calendar1.SelectedDates;
        
        foreach (ListItem litem in BulletedList1.Items)
        {
            DateTime date = Convert.ToDateTime(litem.Text);
            dates.Add(date);
        }
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>How to select random dates in Calendar control</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:SlateBlue; font-style:italic;">
            How to select random dates in Calendar control
        </h2>
        <hr width="500" align="left" color="SlateGray" />
        <asp:BulletedList
             ID="BulletedList1"
             runat="server"
             Visible="false"
             >
        </asp:BulletedList>
        <asp:Calendar
            ID="Calendar1" 
            runat="server"
            NextPrevFormat="FullMonth"
            ForeColor="WhiteSmoke"
            SelectionMode="Day"
            DayNameFormat="Full"
            Font-Names="Book Antiqua"
            Font-Size="Medium"
            OnSelectionChanged="Calendar1_SelectionChanged"
            >
            <DayHeaderStyle
                 BackColor="OliveDrab"
                 />
            <DayStyle
                 BackColor="DarkOrange"
                 BorderColor="Orange"
                 BorderWidth="1"
                 Font-Bold="true"
                 Font-Italic="true"
                 Font-Size="Large"
                 />
            <NextPrevStyle
                 Font-Italic="true"
                 Font-Names="Arial CE"
                 />
            <OtherMonthDayStyle BackColor="OrangeRed" />
            <SelectedDayStyle
                 BackColor="DarkSeaGreen"
                 BorderColor="OliveDrab"
                 />
            <TitleStyle
                 BackColor="MidnightBlue"
                 Height="36"
                 Font-Size="Large"
                 Font-Names="Courier New Baltic"
                 />
        </asp:Calendar>
    </div>
    </form>
</body>
</html>
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