|  EventingFailure | Raised when a failure in the eventing infrastructure occurs. | 
|  Notification | Raised for every OPC event subscribed to by the SubscribeEvents method. This method can be called whether this is a refresh or standard event notification. | 
 
            |  EventingFailure | Raised when a failure in the eventing infrastructure occurs. | 
|  Notification | Raised for every OPC event subscribed to by the SubscribeEvents method. This method can be called whether this is a refresh or standard event notification. |