// Adds list items such as negative keywords to the corresponding list.

        private async Task <AddListItemsToSharedListResponse> AddListItemsToSharedListAsync(
            IList <SharedListItem> listItems,
            SharedList sharedList)
        {
            var request = new AddListItemsToSharedListRequest
            {
                ListItems  = listItems,
                SharedList = sharedList
            };

            return(await Service.CallAsync((s, r) => s.AddListItemsToSharedListAsync(r), request));
        }
        // Adds list items such as negative keywords to the corresponding list. 

        private async Task<AddListItemsToSharedListResponse> AddListItemsToSharedListAsync(
            IList<SharedListItem> listItems,
            SharedList sharedList)
        {
            var request = new AddListItemsToSharedListRequest
            {
                ListItems = listItems,
                SharedList = sharedList
            };

            return (await Service.CallAsync((s, r) => s.AddListItemsToSharedListAsync(r), request));
        }