public RedirectResult addFrend(string username)
 {
     AddingFriend f = new AddingFriend();
     f.UserFriend = username;
     Create(f);
     return new RedirectResult(Url.Action("UserData", "Account", new {user = username } ));
 }
        public ActionResult Create(AddingFriend friend)
        {
            if (Membership.GetUser(friend.UserFriend) != null)
            {
                Friendship fs = new Friendship();
                fs.User = (Guid)Membership.GetUser().ProviderUserKey;
                fs.UserFriend = (Guid)Membership.GetUser(friend.UserFriend).ProviderUserKey;

                db.Friendships.Add(fs);
                db.SaveChanges();
            }
            return RedirectToAction("Index");
        }