Customizing the Calendar Control

HTML Syntax of the Calendar Control

<asp:Calendar ID="myCal" runat="server" Caption="My Calendar" CaptionAlign="Top"
            CellPadding="2" CellSpacing="2" ShowTitle="true" OnDayRender="myCal_DayRender"
            Font-Names="verdana" Font-Size="Small">

            <DayHeaderStyle BackColor="CadetBlue" HorizontalAlign="center"
                VerticalAlign="Middle" />
            <WeekendDayStyle BackColor="gray"></WeekendDayStyle>

            <SelectedDayStyle BackColor="BurlyWood" ForeColor="DarkBlue" Font-Names="Calibri"
                Font-Bold="true" />
        </asp:Calendar>

Code Behind event for the Calendar Control

protected void myCal_DayRender(object sender, DayRenderEventArgs e)
    {
        // Change the background color of the days in the month to yellow. 
        if (!e.Day.IsOtherMonth && !e.Day.IsSelected)
            e.Cell.BackColor = System.Drawing.Color.AliceBlue;

        // Display vacation dates in yellow boxes with purple borders. 
        Style vacationStyle = new Style();
        vacationStyle.BackColor = System.Drawing.Color.Gray;
        vacationStyle.ForeColor = System.Drawing.Color.LightGray;
        vacationStyle.BorderWidth = 1;
        vacationStyle.Font.Strikeout = true;

        // Display weekend dates in green boxes. 
        Style weekendStyle = new Style();
        weekendStyle.BackColor = System.Drawing.Color.Gray;


        if ((e.Day.Date >= new DateTime(2008, 05, 01)) &&
            (e.Day.Date <= new DateTime(2008, 05, 10)))
        {
            // Apply the vacation style to the vacation dates. 
            e.Cell.ApplyStyle(vacationStyle);
            //e.Cell.Enabled = false;
            e.Cell.Text = e.Day.DayNumberText;
        }
        else if (e.Day.IsWeekend)
        {
            // Apply the weekend style to the weekend dates. 
            e.Cell.ApplyStyle(weekendStyle);
            e.Cell.Enabled = false;
            e.Cell.Text = e.Day.DayNumberText;
        }

        DateTime myAppointment = new DateTime(DateTime.Today.Year , 05, 26);
        if (e.Day.Date == myAppointment)
        {
            e.Day.IsSelectable = false;
            e.Cell.Controls.Add(new LiteralControl("
My Appointment")); 
        }
        else
        {
            e.Day.IsSelectable = true;
        } 
    }