[Transactional]
        public async Task CreateAsync(OrganizationalUnitCreateModel model)
        {
            Guard.ArgumentNotNull(model, nameof(model));

            if (model.ParentId.HasValue)
                await _manager.CheckIsDeactiveAsync(model.ParentId.Value).ConfigureAwait(false);
            //...

        }

        public ActionResult Details(int id)
        {
            var user=_userService.GetById(3); // این متد ممکن است مقداری برگرداند و یا مقدار نال برگرداند
            if( user == null)
                 return HttpNotFound();
            return View(user);
        }

public ActionResult Details(int id)
        {
            var user = _userService
                            .GetById(3)
                            .DefaultIfEmpty(new User())
                            .Single();
            return View(user);
        }

public ActionResult Details(int id)
{
    return View(_userService.GetById(3) ?? new User()); 
}

public ActionResult Details(int id)
{
    var user = _userService.GetById(3);
    return user == null ? HttpNotFound() : View(user);
}

  private static bool ShouldIgnoreRequest(CookieValidateIdentityContext context)
        {
            string[] reservedPath =
            {
                "/__browserLink",
                "/img",
                "/fonts",
                "/Scripts",
                "/Content",
                "/Uploads",
                "/Images"
            };
            return reservedPath.Any(
                path => context.OwinContext.Request.Path.Value.StartsWith(path, StringComparison.OrdinalIgnoreCase)) ||
                   BundleTable.Bundles.Select(bundle => bundle.Path.TrimStart('~'))
                       .Any(
                           bundlePath =>
                               context.OwinContext.Request.Path.Value.StartsWith(bundlePath,
                                   StringComparison.OrdinalIgnoreCase));
        }

                    //...
                    if (ShouldIgnoreRequest(context)) return;
                    var manager = context.OwinContext.GetUserManager<ApplicationUserManager>();
                    var userId = getUserIdCallback(context.Identity);
                    //...

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="Microsoft.Owin" version="3.0.0" targetFramework="net45" />
  <package id="RavenDB.Client" version="2.0.2375" targetFramework="net45" />
</packages>

<?xml version="1.0" encoding="utf-8"?>
<repositories>
  <repository path="..\Application\Test\packages.config" />
  <repository path="..\ViewModel\Test\packages.config" />
</repositories>

ALTER TRIGGER [dbo].[Prevent_Befor_Insert_Null]
   ON  [dbTest].[dbo].[tblTest] 
   INSTEAD OF INSERT 
AS 
BEGIN
SET NOCOUNT ON
IF OBJECT_ID(N'dbTest.dbo.tblTest.FirstName') is null
BEGIN
DECLARE @Id int
SET @Id = (select Id from inserted)
RAISERROR ('مقدار فیلد نام نباید خالی باشد',16,1)
ROLLBACK
END
END