public PerformanceCounterPersistenceEngine(IPersistStreams persistence, string instanceName)
 {
     _persistence = persistence;
     _counters    = new PerformanceCounters(instanceName);
 }
 public PerformanceCounterPersistenceEngine(IPersistStreams persistence, string instanceName)
 {
     _persistence = persistence;
     _counters = new PerformanceCounters(instanceName);
 }