[HttpPost]
        [AjaxOnly]
        public virtual async Task<ActionResult> GetParts([DataSourceRequest] DataSourceRequest request)
        {
            return await DoBaseOperationAsync(() =>
            {
                var result = _partService.GetParts.Where(p => p.IsActive).AsLookupItemModel(p => p.PartId, p => p.CodeName);

                var data = result.ToDataSourceResult(request);
                return Json(data);
            });
        }

 protected async Task<ActionResult> DoBaseOperationAsync(Func<ActionResult> func, string title = null, string message = null, MessageType messageType = MessageType.Error)
        {
            try
            {           
                AsyncManager.OutstandingOperations.Increment();

                var cultureInfo = new CultureInfo(CultureHelper.GetCultureString());

                return func != null ? await Task.Factory.StartNew(() =>
                {
                    System.Web.HttpContext.Current = ControllerContext.HttpContext.ApplicationInstance.Context;

                    Thread.CurrentThread.CurrentUICulture = cultureInfo;
                    Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(cultureInfo.Name);

                    return func.Invoke();

                }) : null;

            }
            catch (Exception ex)
            {
                ErrorSignal.FromCurrentContext().Raise(ex);

           // Some code for error handling
            }
        }

 public async Task<Maybe<Post>> FindByIdAsync(Guid id)
        {
            Maybe<Post> post = await _posts.FindAsync(id);
            return post;
        }

 public async Task<Result> DeletePost(Guid id)
        {
            return await FindByIdAsync(id)
                .ToResult("پست مورد نظر یافت نشد.")
                .OnSuccess(x => _posts.Remove(x))
                .OnSuccess(x => _unitOfWork.SaveChangesAsync())
                .OnBoth(x => x.IsSuccess ? Result.Ok() : Result.Fail(x.Error));
        }

using (var store = new DocumentStore
            {
                Url = "http://localhost:8080"
            }.Initialize())
            {
                using (var session = store.OpenSession())
                {
                    store.DatabaseCommands.PutAttachment(key: "file/1",
                                                         etag: null,
                                                         data: System.IO.File.OpenRead(@"D:\Prog\packages.config"),
                                                         metadata: new RavenJObject
                                                         {
                                                            { "Description", "توضیحات فایل" }
                                                         });
                    var question = new Question
                    {
                        By = "users/Vahid",
                        Title = "Raven Intro",
                        Content = "Test....",
                        FileId = "file/1"
                    };
                    session.Store(question);

                    session.SaveChanges();
                }
            }

 var fileStore = new FilesStore()
            {
                Url = "http://localhost:8080",
                DefaultFileSystem = "SampleFs"
            };
            fileStore.Initialize();

 var session = fileStore.OpenAsyncSession();
 var stream = File.OpenRead("D:\\Apocalypse.Now.Redux.1979.BDRip.YIFY.mkv");  

  var metadata = new RavenJObject
            {
                {"User", "users/1345"},
              {"Director","Francis Ford Coppola" }, 
                {"Year","1979" }
            };

session.RegisterUpload("mkv/sample.mkv", stream, metadata);

await session.SaveChangesAsync();

    var fileStore = new FilesStore()
            {
                Url = "http://localhost:8080",
                DefaultFileSystem = "SampleFs"
            };
            fileStore.Initialize();

            var session = fileStore.OpenAsyncSession();
             var stream = File.OpenRead("D:\\Apocalypse.Now.Redux.1979.BDRip.YIFY.mkv"); 
            var metadata = new RavenJObject
            {
                {"User", "users/1345"},
               {"Director","Francis Ford Coppola" }, 
                {"Year","1979" }
            };

            session.RegisterUpload("Mkv/sample.mkv", stream, metadata);
            await session.SaveChangesAsync();

{
    "User": "users/1345",
    "Country": "Iran",
    "City": "Kashan",
    "Raven-Synchronization-History": [
        {
            "Version": 4,
            "ServerId": "42d0cccb-103d-4bf0-9f3d-6f635b1c8ba4"
        },
        {
            "Version": 5,
            "ServerId": "42d0cccb-103d-4bf0-9f3d-6f635b1c8ba4"
        }
    ],
    "Raven-Synchronization-Version": "6",
    "Raven-Synchronization-Source": "42d0cccb-103d-4bf0-9f3d-6f635b1c8ba4"
}

var fileStore = new FilesStore()
            {
                Url = "http://localhost:8080",
                DefaultFileSystem = "SampleFs"
            };
            fileStore.Initialize();

            var session = fileStore.OpenAsyncSession();
            var file = await session.Query()
                   .WhereEquals("Year", "1979")
                   .FirstOrDefaultAsync();

var stream = await session.DownloadAsync("mkv/"+file.Name);

   var fs = File.Create("D:\\file2.mkv");
            stream.CopyTo(fs);
            fs.Flush();
            fs.Close();

await stream.CopyToAsync(fs);

            var fileStore = new FilesStore()
            {
                Url = "http://localhost:8080",
                DefaultFileSystem = "SampleFs"
            };
            fileStore.Initialize();

            var session = fileStore.OpenAsyncSession();
            var file = await session.Query()
                   .WhereEquals("Year", "1979")
                   .FirstOrDefaultAsync();

            var stream = await session.DownloadAsync("mkv/"+file.Name);

            var fs = File.Create("D:\\file2.mkv");

            await stream.CopyToAsync(fs);