Use the C1CalendarExtender to create a single-month calendar or a table of months with customizable styles and navigation elements.
C1CalendarExtender Markup
The following markup creates a C1CalendarExtender control. Set the TargetControlID property to attach the extender to a control.
<cc1:C1CalendarExtender ID="Panel1_C1CalendarExtender" runat="server"
DisplayDate="11/03/2011 13:17:14" TargetControlID="Panel1">
</cc1:C1CalendarExtender>