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Get or sets the WeekOfMonthEnum value specifying the count for which the recurrence pattern is valid for a given interval. This property is only valid for recurrences of the MonthlyNth and YearlyNth types and allows the definition of a recurrence pattern that is only valid for the Nth occurrence, such as "the 2nd Sunday in March" pattern. The default value is WeekOfMonthEnum.First.
public WeekOfMonthEnum Instance { get; set; }