public async Task<IdentityResult> RegisterUser(UserModel userModel)
        {
            IdentityUser user = new IdentityUser()
            {
                UserName = userModel.UserName
            };

            var result = await _userManager.CreateAsync(user, userModel.Password);

            return result;
        }
        public async Task<IHttpActionResult> Register(UserModel userModel)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            IdentityResult result = await _repo.RegisterUser(userModel);

            IHttpActionResult errorResult = GetErrorResult(result);

            return errorResult ?? Ok();
        }