public void CreateUser(RegisterUserModel user)
        {
            var bllUser = user.ToBll();

            bllUser.Salt = GenerateSalt();
            bllUser.Password = ComputePasswordHash(user.Password, bllUser.Salt);
            userService.CreateUser(bllUser);

            Roles.AddUserToRole(user.Username, "user");
            var addedUser = userService.GetUserEntity(user.Username);

            CreateAvatar(addedUser.Id, user.Avatar);
        }