public ActionResult AddUser(AddUserViewModel model)
        {
            if (User.Identity.IsAuthenticated && User.IsInRole("Admin"))
            {
                if (ModelState.IsValid)
                {
                    var user = new ApplicationUser {
                        UserName = model.Email, Email = model.Email, PhoneNumber = "+38 " + model.PhoneNumber
                    };
                    var result = UserManager.Create(user, model.Password);
                    if (result.Succeeded)
                    {
                        SiteUserManager.AddSiteUser(model, user.Id, Server);
                        return(RedirectToAction("Users", "Admin"));
                    }

                    AddErrors(result);
                }
                return(View(model));
            }
            return(RedirectToAction("Index", "Home"));
        }