using new Task(async) to serialize Send

C-UI/SCU_Store.cs

@@ -26,23 +26,20 @@ namespace C_UI
             var client = new DicomClient(inputsDto.ServerHost, inputsDto.Port, false, inputsDto.ServerAET, inputsDto.Aet);
             client.NegotiateAsyncOps();
             inputsDto.FileNames.ToObservable()
-             .Select(async fileName =>
+                .Select(fileName => new Task(async () =>
                  {
                      var request = new DicomCStoreRequest(fileName);
                      request.OnResponseReceived += (req, response) => logger.Info($"{response.Status}-{fileName}");
                      await client.AddRequestAsync(request);
                      await client.SendAsync();
-             })
-             .Select(
-                t => t.Exception.Flatten()
-             )
+                 }).ToObservable().Select(x => fileName))
+                .Concat()
                 .Subscribe(
                     filename =>
                         logger.Warn($"file sent:{filename}"),
                     onError =>
-                    logger.Error(onError.Message ),            
-                () => { }
-             );
+                        logger.Error(onError.Message),
+                    () => { });
         }
     }
 }