The Count property indicates the number of MarkZone objects in the MarkZones collection. The Item property gets a time-zone based on its key. The Start property indicates the starting date/time of the time-zone. The End property indicates the starting date/time of the time-zone.  The for each statement is supported by the MarkZones collection, so the MarkZones collection can be enumerated using a sample like  for each mz in MarkZones