ASP.NET Calendar - Airline tickets

Departing date
    Select date
 
2007
2008
2009
2010
2011
2012
2013
 

Returning date
    Select date
 
2007
2008
2009
2010
2011
2012
2013
 

Notice that Returning date cannot be earlier than Departing date.

This validation happens automatically by calendar.

ASP.NET

<obout:Calendar runat="server"
                         id="startCal">
</obout:Calendar>


<obout:Calendar runat="server"
                         BeginDateCalendarId="startCal">
</obout:Calendar>    

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