fileName.OpenReadStream is used

Controllers/SCUController.cs

@@ -7,6 +7,7 @@ using System.Reactive.Linq;
 using System.Reactive.Threading.Tasks;
 using System.Threading;
 using System.Threading.Tasks;
+using Dicom;
 using Dicom.Network.Client;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
@@ -52,15 +53,12 @@ namespace SendFileWebapi.Controllers
             inputsDto.FileNames.ToObservable()
                 .Select(fileName => Observable.FromAsync(async () =>
             {
-                FileStream fileStream = null;
-                using (var stream = new FileStream(fileName.FileName, FileMode.Create))
+                using (var stream = fileName.OpenReadStream())
                 {
-                    await fileName.CopyToAsync(stream);
-                    fileStream = stream;
+                    var request = new Dicom.Network.DicomCStoreRequest(await DicomFile.OpenAsync(stream));
+                    await client.AddRequestAsync(request);
+                    await client.SendAsync();
                 }
-                var request = new Dicom.Network.DicomCStoreRequest(fileStream.Name);
-                await client.AddRequestAsync(request);
-                await client.SendAsync();
             }).Select(x => fileName.FileName).Catch<string, Exception>(exp => throw new Exception($"failed to send: {fileName}, with error:{exp.Message}")))
                 .Concat()
                 .Subscribe(