DisabledDates Property

using Infragistics.Windows.Editors;
using Infragistics.Windows.Controls;

        private void InitializeCalendar(XamMonthCalendar calendar)
        {
            // the DisabledDates is a collection of CalendarDateRange objects
            // that can be used to disable one or more specific dates
            CalendarDateRange range1 = new CalendarDateRange(new DateTime(2008, 12, 25));
            calendar.DisabledDates.Add(range1);

            CalendarDateRange range2 = new CalendarDateRange();
            range2.Start = new DateTime(2009, 1, 1);
            range2.End = new DateTime(2009, 1, 5);
            calendar.DisabledDates.Add(range2);

            // DisabledDaysOfWeek is a flagged enumeration of the days of the week
            // that should be disabled and therefore disallow activation and selection
            calendar.DisabledDaysOfWeek = DayOfWeekFlags.Saturday | DayOfWeekFlags.Sunday;

            // since disabled days of the week cannot be activated/selected, you can
            // choose to hide them from the display
            calendar.ShowDisabledDaysOfWeek = false;

            // the min/max dates control the range of dates that are available
            // for activation/selection. any dates outside this range will not
            // be shown
            calendar.MinDate = new DateTime(2008, 1, 1);
            calendar.MaxDate = new DateTime(2099, 12, 31);
        }