public async Task <ContentResult> UploadAsync()
        {
            try
            {
                var          file       = Request.Form.Files[0];
                var          blobName   = file.FileName;
                MemoryStream filestream = new MemoryStream();
                await file.CopyToAsync(filestream);

                await _imageStorageService.UploadAsync(blobName, filestream);

                return(Content(file.FileName));
            }
            catch (Exception)
            {
                return(Content("Failed to uploud file."));
            }
        }