{
    "direction": "desc",
    "on_page": 30,
    "success": "ok",
    "pages": 6,
    "domain": "site.ru",
    "order": "uid",
    "box_limit": 1000,
    "accounts": [
        {
            "fname": "Молчанова",
            "birth_date": null,
            "login": "molchanova@site.ru",
            "fio": "Молчанова  Юля"
        },
        {
            "fname": "Прекрасная",
            "birth_date": null,
            "login": "torg382@site.ru",
            "fio": "Прекрасная  Елена"
        },
        {

            "fname": "Никитина",
            "birth_date": null,
            "login": "nikitina@site.ru",
            "fio": "Никитина  Елена"
        },
        {
            "fname": "Кутищева",
            "birth_date": null,
            "login": "kutisheva@site.ru",
            "fio": "Кутищева  Мария"
        },
    ],
    "offset": null,
    "found": 30,
    "total": 160,
   "page": 1
}

JObject rss = JObject.Parse(result);
foreach(var s in rss["accounts"])
{
    return (string)s["fname"];
}