C# 日曆(Calendar)日期多選

        protected void btnSelect_Click(object sender, EventArgs e)
        {
            int current_year = MyCalendar.VisibleDate.Year;
            int current_month = MyCalendar.VisibleDate.Month;
            DateTime BeginningDate = new DateTime(current_year, current_month, 10);
            DateTime EndingDate = new DateTime(current_year, current_month, 20);

            MyCalendar.SelectedDates.Clear();

            // 選取一段日期範圍
            MyCalendar.SelectedDates.SelectRange(BeginningDate, EndingDate);
            CountSelection();
        }

MyCalendar.SelectedDates.SelectRange(BeginningDate, EndingDate);