WinRTXamlToolkit.Controls.Calendar.ProcessEndKey C# (CSharp) Method

        internal void ProcessEndKey(bool shift)
        {
            switch (DisplayMode)
            {
                case CalendarMode.Month:
                    {
                        if (DisplayDate != null)
                        {
                            DateTime? selectedDate = new DateTime(DisplayDateInternal.Year, DisplayDateInternal.Month, 1);

                            if (DateTimeHelper.CompareYearMonth(DateTime.MaxValue, selectedDate.Value) > 0)
                            {
                                // since DisplayDate is not equal to
                                // DateTime.MaxValue we are sure selectedDate is\
                                // not null
                                selectedDate = DateTimeHelper.AddMonths(selectedDate.Value, 1).Value;
                                selectedDate = DateTimeHelper.AddDays(selectedDate.Value, -1).Value;
                            }
                            else
                            {
                                selectedDate = DateTime.MaxValue;
                            }
                            ProcessSelection(shift, selectedDate, null);
                        }
                        break;
                    }
                case CalendarMode.Year:
                    {
                        DateTime selectedMonth = new DateTime(_selectedMonth.Year, 12, 1);
                        OnSelectedMonthChanged(selectedMonth);
                        break;
                    }
                case CalendarMode.Decade:
                    {
                        DateTime? selectedYear = new DateTime(DateTimeHelper.EndOfDecade(SelectedYear), 1, 1);
                        OnSelectedYearChanged(selectedYear);
                        break;
                    }
            }
        }