The Calendar control allows the user to select a single date.

Disabling or enabling the selection of dates can be controlled by the SelectableDateStart and SelectableDateEnd properties. If none of the latter two has been set, i.e. their value is null then all the calendar dates are selctable.

The SelectedValue property holds the DateTime value of the selected date. The default value is null (no date is selected). Adding a handler for the SelectedValueChanged event would enable you to be notified whenever a date is selected.

Similarly, to modify which dates the user can navigate to, use the DisplayDateStart and DisplayDateEnd properties. Setting the DisplayDate property navigates the calendar to the month or year that contain this date (depending on the current DisplayMode).