public async Task<IdentityResult> RegisterUser(RegisterUserViewModel registerUserViewModel) {
			AppUser user = new AppUser {
				UserName = registerUserViewModel.UserName
			};

			var result = await userManager.CreateAsync(user, registerUserViewModel.Password);
			return result;
		}
        public async Task<IHttpActionResult> Register(RegisterUserViewModel registerUserViewModel)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            IdentityResult result = await repository.RegisterUser(registerUserViewModel);

            IHttpActionResult errorResult = GetErrorResult(result);

            if (errorResult != null)
            {
                return errorResult;
            }

            return Ok();
        }