public sealed class TraceManager : ArcGIS.Core.CoreObjectsBase, System.IDisposable  

{
  // This routine creates a DownstreamTracer object from a UtilityNetwork
  static void CreateADownstreamTracerObject(UtilityNetwork utilityNetwork)
  {
    using TraceManager traceManager = utilityNetwork.GetTraceManager();
    DownstreamTracer downstreamTracer = traceManager.GetTracer<DownstreamTracer>();
  }
}