Weekend Color in Ajax Calender Control

<asp:Calendar ID="Calendar1" ShowGridLines="true" CellPadding="15"  runat="server"
          OnDayRender="Calendar1_DayRender"  OnSelectionChanged="Calendar1_SelectionChanged  ">

          </asp:Calendar>

protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
{
    if (e.Day.IsWeekend) {
        e.Cell.BackColor = System.Drawing.Color.Aqua;
    }
}