Gets a value that indicates whether the date represented by an instance of this class is selected in the System.Web.UI.WebControls.Calendar control. This property is read-only.
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Use the CalendarDay.IsSelected property to programmatically determine whether the date represented by an instance of this class is selected in the System.Web.UI.WebControls.Calendar control. This allows you to programmatically control the appearance or behavior of the day, based on this value.