public DataTable allTicker()
        {
            string    param   = string.Empty;
            DataTable markets = getMarketList();

            string[] columns = markets.AsEnumerable().Select(r => r.Field <string>("market")).ToArray();
            param = String.Join(",", columns);
            return(JsonConvert.DeserializeObject <DataTable>(quotation.GetTicer(param)));
        }