public ActionResult ManageUserRoles(string selectedRole, string id)
        {
            var userDB = UserHelper.GetUserById(id);
            var roles  = UserHelper.GetRoles(id).ToArray();

            UserHelper.RemoveFromRoles(id, roles);
            UserHelper.AddToRole(id, selectedRole);

            //: Refresh authentication cookies so the roles are updated instantly
            //var signInManager = HttpContext.GetOwinContext().Get<ApplicationSignInManager>();
            //signInManager.SignIn(userDB, isPersistent: false, rememberBrowser: false);
            return(RedirectToAction("Index"));
        }