public ActionResult Create(PortfolioCreationDto portfolioParams)
        {
            if (ModelState.IsValid)
            {
                var currentUser = db.UserProfiles.Single(u => u.UserName == User.Identity.Name);
                var portfolio = new Portfolio { Name = portfolioParams.Name, Owner = currentUser };
                db.Portfolios.Add(portfolio);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(portfolioParams);
        }
        public ActionResult Create(PortfolioCreationDto portfolioParams)
        {
            if (ModelState.IsValid)
            {
                var currentUser = db.UserProfiles.Single(u => u.UserName == User.Identity.Name);
                var portfolio   = new Portfolio {
                    Name = portfolioParams.Name, Owner = currentUser
                };
                db.Portfolios.Add(portfolio);
                db.SaveChanges();
                return(RedirectToAction("Index"));
            }

            return(View(portfolioParams));
        }