public static void GetInstanceASync(CimSession cimSession, string cimNamespace, string cimClassName)
        {
            // Check Arguments
            if (cimNamespace == null)
            {
                throw new ArgumentNullException("cimNamespace");
            }

            if (cimClassName == null)
            {
                throw new ArgumentNullException("cimClassName");
            }

            try
            {
                CimInstance inputInstance = GetInstanceCore(cimSession, cimNamespace, cimClassName);
                IObservable <CimInstance>  enumeratedInstances = cimSession.GetInstanceAsync(cimNamespace, inputInstance, GetOperationOptions());
                TestObserver <CimInstance> observer            = new TestObserver <CimInstance>();
                IDisposable disposeable = enumeratedInstances.Subscribe(observer);
                observer.WaitForCompletion();
            }
            catch (CimException ex)
            {
                PrintCimException(ex);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }