How to limit calender extender to select dates from a week before to present date?

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ASP.NET

Ajax

Hi All,
How to limit calender extender to select dates from a week before to present date?

<asp:CalendarExtender ID="CalendarExtender1" Format="yyyy-MM-dd" TargetControlID="txtDateRangeFROM"
                  runat="server">
              </asp:CalendarExtender>

Please give me any suggestions,

thanks and regards,
mani.