OpenTween.Twitter.ContainsUserAtList C# (CSharp) Method

        public async Task<bool> ContainsUserAtList(long listId, string user)
        {
            this.CheckAccountState();

            try
            {
                await this.Api.ListsMembersShow(listId, user)
                    .ConfigureAwait(false);

                return true;
            }
            catch (TwitterApiException ex)
                when (ex.ErrorResponse.Errors.Any(x => x.Code == TwitterErrorCode.NotFound))
            {
                return false;
            }
        }