public Task <ITwitterResult <ITwitterListDTO, ITwitterList> > AddMemberToListAsync(IAddMemberToListParameters parameters) { _validator.Validate(parameters); return(ExecuteRequestAsync(async request => { var twitterResult = await _twitterListController.AddMemberToListAsync(parameters, request).ConfigureAwait(false); return _twitterResultFactory.Create(twitterResult, dto => _factories.CreateTwitterList(dto)); })); }