public override SortedDictionary<string, object> ToParamsDictionary()
{
SortedDictionary<string, object> dict = base.ToParamsDictionary();
if (MaxResults > 0)
AddParam(dict, "max_results", MaxResults.ToString());
AddParam(dict, "next_cursor", NextCursor);
AddParam(dict, "prefix", Prefix);
return dict;
}