File upload with NancyFX

UploadModule.cs

namespace NancyUpload
{
    using System;
    using System.IO;
    using System.Linq;
    using Nancy;

    public class UploadModule : NancyModule
    {
        public UploadModule(): base()
        {
            Post["upload"] = _ =>
            {
                var file = Request.Files.Single();
                var fullName = Path.Combine(
                  Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), file.Name);

                using (var fileStream = File.OpenWrite(fullName))
                {
                    file.Value.CopyTo(fileStream);
                }

                return HttpStatusCode.OK;
            };
        }
    }
}