static void Main(string[] args)
        {
            WebRequest request = WebRequest.Create("http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.historicaldata%20where%20symbol%20=%20%22TIBX%22%20and%20startDate%20=%20%222013-01-01%22%20and%20endDate%20=%20%222014-01-01%22&format=json&diagnostics=true&env=store://datatables.org/alltableswithkeys");
            WebResponse response = request.GetResponse();

            using (Stream stream = response.GetResponseStream())
            {
                Type serializationTargetType = typeof(JsonContract);
                DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(serializationTargetType);

                JsonContract jsonDeserialized = (JsonContract)jsonSerializer.ReadObject(stream);
            }
        }

    public class JsonContract
    {
        public QueryContract query { get; set; }
    }

    public class QueryContract
    {
        public string count { get; set; }
        public string created { get; set; }
        public string lang { get; set; }
        public DiagnosticsContract diagnostics { get; set; }
        public ResultsContract results { get; set; }
    }

    public class ResultsContract
    {
        public List<QuoteContract> quote { get; set; }
    }

    public class QuoteContract
    {
        public string Symbol { get; set; }
        public string Date { get; set; }
        public string Open { get; set; }
        public string High { get; set; }
        public string Low { get; set; }
        public string Close { get; set; }
        public string Volume { get; set; }
        public string Adj_Close { get; set; }
    }

    public class DiagnosticsContract
    {
        public List<UrlContract> url { get; set; }
        public string publiclyCallable { get; set; }
        public List<CacheContract> cache { get; set; }
        public List<Query2Contract> query { get; set; }
        public JavascriptContract javascript { get; set; }
    }

    [DataContract]
    public class UrlContract
    {
        [DataMember(Name = "execution-start-time")]
        public string ExecutionStartTime { get; set; }
        [DataMember(Name = "execution-stop-time")]
        public string ExecutionStopTime { get; set; }
        [DataMember(Name = "execution-time")]
        public string ExecutionTime { get; set; }
        [DataMember(Name = "content")]
        public string Content { get; set; }
    }

    public class CacheContract
    {
    }

    public class Query2Contract
    {
    }

    public class JavascriptContract
    {
    }