ASP.NET Calendar - Tutorial - DateRange

Departing date
    Select date

Returning date
    Select date

Notice that Returning date cannot be earlier than Departing date.
This validation happens automatically by calendar.

To link two calendars to select a date range, set BeginDateCalendarId property of an end date calendar to the ID of the start date calendar.

When calendars are linked, they share the same DateMin and DateMax values.

Departing date:   Departing date:
<obout:Calendar runat="server"
class="claret"> id="startCal">
</obout:Calendar>
Returning date:  
Returning date:
<obout:Calendar runat="server"
class="claret"> BeginDateCalendarId="startCal">
</obout:Calendar>