Public Overridable Function ModifyMonitoredItems( _
   ByVal requestHeader As RequestHeader, _
   ByVal subscriptionId As UInteger, _
   ByVal timestampsToReturn As TimestampsToReturn, _
   ByVal itemsToModify As MonitoredItemModifyRequestCollection, _
   ByRef results As MonitoredItemModifyResultCollection, _
   ByRef diagnosticInfos As DiagnosticInfoCollection _
) As ResponseHeader

public virtual ResponseHeader ModifyMonitoredItems( 
   RequestHeader requestHeader,
   uint subscriptionId,
   TimestampsToReturn timestampsToReturn,
   MonitoredItemModifyRequestCollection itemsToModify,
   out MonitoredItemModifyResultCollection results,
   out DiagnosticInfoCollection diagnosticInfos
)