public static void GetNext(RecurrenceRule obj, MethodReturnEventArgs<DateTime> e, DateTime start, DateTime dt)
{
var occurrences = obj.GetWithinInterval(start, dt, dt.Add(GetIntervalTimeSpan(obj.Frequency, obj.Interval)));
e.Result = occurrences.Where(i => i != dt).FirstOrDefault();
if (e.Result == default(DateTime)) e.Result = dt;
}