public ActionResult RequestDetails(string requestId, string requestState)
    {
        // ToDo handle parameter

        return View();
    }

ShowDetails = function (e) {
    e.preventDefault();
    var dataItem = this.dataItem($(e.currentTarget).closest("tr"));

    $.ajax({
        type: 'GET',
        data: {
            'requestId': dataItem.RequestId,
            'requestState': dataItem.RequestState
        },
        url: "/Controller/RequestDetails",
        contentType: 'application/json; charset=utf-8'
    });
}