Use the Selection property to save the selected dates as a string, and to restore them later when loading. When the SingleSel property is set to True, use the SelDate property to select a date. In this mode, the focused date is also updated. You can use the FocusDate property to specify which date has the focus. When the SingleSel property is False, use the SelectDate and SelCount properties to enumerate the selected dates. The control raises the SelectionChanged event whenever the user selects a new date. To work with the visible range, use the FirstVisibleDate property to get the first visible date, and the LastVisibleDate property to get the last visible date.