This is a really minor problem, but an off-by-one error occurs within the Recurrence class' ToString method when the Pattern is set to Yearly. The error causes ToString to misinterpret the value for the DayOfMonth property. By design, the DayOfMonth must be an Integer between 1 and 12. By contrast, the ToString method (apparently) uses a zero-based array to store the names of the months, but does not correct for the 1-based DayOfMonth value. For example, the procedure below should popup a MessageBox with the text "Occurs every January 1 effective..."

    Public Sub TestRecurrenceToString()
       Dim rec As New MindFusion.Scheduling.Recurrence

       rec.Pattern = MindFusion.Scheduling.RecurrencePattern.Yearly
       rec.MonthOfYear = 1

       MessageBox.Show(rec.ToString)

    End Sub


Instead the message reads "Occurs every February 1 effective..."

Also, as I was playing around this little conundrum, I tried setting the MonthOfYear to zero and got the following exception Message, obviously a refugee from the StartHour() property procedure:

'0' is not a valid value for 'StartHour'. 'StartHour' must be greater than or equal to '1' and less than or equal to '12'.
Parameter name: value

Like I said, this is a minor problem because the ToString method is not critical to the internal workings of the Recurrence class. But I like it because it generates a nice descriptive string which the user can understand.