public RedisValue Sort(string key, string by, bool alpha, bool descending, int? start, int? count)
{
var transformedKey = TransformKey(key);
var sb = new SortBuilder(transformedKey)
.Alpha(alpha)
.Desc(descending);
if (!String.IsNullOrEmpty(by))
sb.By(by);
if (start.HasValue && count.HasValue)
sb.Limit(start.Value, count.Value);
var command = new SortCommand(sb);
return ExecValue(key, command);
}