public string Binding()
        {
            GridRequestParameters param = GridRequestParameters.Current;

            List <currency> items = RepoCurrency.Find(param.Skip, param.Take, (param.Sortings != null ? param.Sortings.ToList() : null), (param.Filters != null ? param.Filters : null));
            int             total = RepoCurrency.Count(param.Filters);

            return(new JavaScriptSerializer().Serialize(new { total = total, data = new CurrencyPresentationStub().MapList(items) }));
        }