private void monthCalendarAdv1_ItemClick(object sender, EventArgs e)

{

    DayLabel label = sender as DayLabel;

    // If day label is clicked and label is used to display week of year

    if (label != null && label.IsWeekOfYear)

    {

        // Ensure that multi-selection is enabled

        monthCalendarAdv1.MultiSelect = true;

        // Get the month control that represents the month that label is assigned to

        // so complete date can be retrieved

        SingleMonthCalendar month = label.Parent as SingleMonthCalendar;

        // Parse the week of year from text

        int week = int.Parse(label.Text);

        // Get the month where week of year clicked resides

        DateTime d = month.DisplayMonth;

        // Forward date to the beginning of the week

        while (CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(d, month.WeekOfYearRule, month.FirstDayOfWeek) != week)

            d = d.AddDays(1);

        // Finally select the week...

        monthCalendarAdv1.SelectionStart = d;

        monthCalendarAdv1.SelectionEnd = d.AddDays(6);

    }

}