public IHttpActionResult AddUser([FromBody] RegisterUserRequest registerRequest) { if (registerRequest.Login == null || registerRequest.Password == null || registerRequest.Email == null) { return(Content(HttpStatusCode.BadRequest, new ErrorResponse(Errors.EMPTY_ONE_OR_MORE_FIELD))); } if (registerRequest.Login.Count() <= 6) { return(Content(HttpStatusCode.BadRequest, new ErrorResponse(Errors.INCORRECT_LOGIN_LENGHT))); } if (registerRequest.Password.Count() < 6 || registerRequest.Password.Count() > 20) { return(Content(HttpStatusCode.BadRequest, new ErrorResponse(Errors.INCORRECT_PASSWORD_LENGHT))); } int indexOfDog = registerRequest.Email.LastIndexOf('@'); if (indexOfDog == -1 || registerRequest.Email.Count() < 5 || indexOfDog >= registerRequest.Email.LastIndexOf('.')) { return(Content(HttpStatusCode.BadRequest, new ErrorResponse(Errors.INCORRECT_EMAIL))); } var result = _authenticationManager.AddUser(registerRequest); if (result == Errors.OK) { return(Content(HttpStatusCode.OK, "User has been added")); } return(Content(HttpStatusCode.BadRequest, new ErrorResponse(result))); }