// [START list]
public BookList List(int pageSize, string nextPageToken)
{
var query = _db.CreateQuery <Book>();
query.Limit = pageSize;
if (!string.IsNullOrWhiteSpace(nextPageToken))
{
query.StartCursor = ByteString.FromBase64(nextPageToken);
}
var results = _db.RunQuery(query);
return(new BookList()
{
Books = results.Entities <Book>(),
NextPageToken = results.Entities.Count == query.Limit ?
results.EndCursor.ToBase64() : null
});
}