private static Task<bool> VerifyClientIdAsync(ApplicationUserManager manager, ApplicationUser user, CookieValidateIdentityContext context)
        {
            string clientId = context.Identity.FindFirstValue("AspNet.Identity.ClientId");
            if (!string.IsNullOrEmpty(clientId) && user.Clients.Any(c => c.Id.ToString() == clientId))
            {
                user.CurrentClientId = clientId;
                return Task.FromResult(true);
            }

            return Task.FromResult(false);
        }
 private static async Task<bool> VerifySecurityStampAsync(ApplicationUserManager manager, ApplicationUser user, CookieValidateIdentityContext context)
 {
     string stamp = context.Identity.FindFirstValue("AspNet.Identity.SecurityStamp");
     return (stamp == await manager.GetSecurityStampAsync(context.Identity.GetUserId()));
 }
        public async Task<ActionResult> Create(RegisterViewModel userViewModel, params string[] selectedRoles)
        {
            if (ModelState.IsValid)
            {
                var user = new ApplicationUser { UserName = userViewModel.Email, Email = userViewModel.Email };
                var adminresult = await UserManager.CreateAsync(user, userViewModel.Password);

                //Add User to the selected Roles 
                if (adminresult.Succeeded)
                {
                    if (selectedRoles != null)
                    {
                        var result = await UserManager.AddToRolesAsync(user.Id, selectedRoles);
                        if (!result.Succeeded)
                        {
                            ModelState.AddModelError("", result.Errors.First());
                            ViewBag.RoleId = new SelectList(await RoleManager.Roles.ToListAsync(), "Name", "Name");
                            return View();
                        }
                    }
                }
                else
                {
                    ModelState.AddModelError("", adminresult.Errors.First());
                    ViewBag.RoleId = new SelectList(RoleManager.Roles, "Name", "Name");
                    return View();

                }
                return RedirectToAction("Index");
            }
            ViewBag.RoleId = new SelectList(RoleManager.Roles, "Name", "Name");
            return View();
        }