ComponentFactory.Krypton.Toolkit.ViewLayoutMonths.PrevMonth C# (CSharp) Method

        public void PrevMonth()
        {
            // Get the number of months to move
            int move = _calendar.ScrollChange;
            if (move == 0)
                move = 1;

            // Calculate the next set of months shown
            DateTime prevMonth = _displayMonth.AddMonths(-move);

            // We do not move the month if doing so moves it past the maximum date
            if (prevMonth >= FirstDayOfMonth(_calendar.MinDate))
            {
                // Use the newly calculated month
                _displayMonth = prevMonth;

                DateTime lastDate = _displayMonth.AddMonths(_calendar.CalendarDimensions.Width *
                                                            _calendar.CalendarDimensions.Height);

                // If the start of the selection is no longer visible
                if (_calendar.SelectionStart >= lastDate)
                {
                    // Find new selection dates
                    DateTime newSelStart = _calendar.SelectionStart.AddMonths(-move);
                    DateTime newSelEnd = _calendar.SelectionEnd.AddMonths(-move);

                    // Impose the min/max dates
                    if (newSelStart < _calendar.MinDate)    newSelStart = _calendar.MinDate;
                    if (newSelEnd < _calendar.MinDate)      newSelEnd = _calendar.MinDate;

                    // Shift selection backwards
                    _calendar.SetSelectionRange(newSelStart, newSelEnd);
                }

                _needPaintDelegate(this, new NeedLayoutEventArgs(true));
            }
        }

 private void OnPrevMonth(object sender, EventArgs e)
 {
     _months.PrevMonth();
 }