i want to set the interval of years in the object of type Microsoft.WindowsMobile.PocketOutlook.AppointmentRecurrence

for eg i have coded like this :

Microsoft.WindowsMobile.PocketOutlook.AppointmentRecurrence obj = new Microsoft.WindowsMobile.PocketOutlook.AppointmentRecurrence();

obj.RecurrenceType = "Yearly";
obj.Interval =2 ;

It is going error. i know we cant set the interval in Yearly events.
it works ok with daily or monthly.
But i have to set the interval with yearly. for eg event after each 2 years.

Any one have idea Help me!!!