public static String Submit(String methodName)

{

    string postData = "this is post data";//请求的数据，后面转换成二进制请求

    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri(URL));

    request.Method = "POST";

    request.ContentType = "application/x-www-form-urlencoded";

    request.Timeout = ;//一分钟

    request.ReadWriteTimeout = ;//一分钟

    request.KeepAlive = false;

    byte[] datas = Encoding.UTF8.GetBytes(postData);

    request.ContentLength = datas.Length;

    Stream requestStream = request.GetRequestStream();

    requestStream.Write(datas, , datas.Length);

    requestStream.Close();

    HttpWebResponse response = null;

    string responseDatas = string.Empty;

    try

    {

        //多线程中调用 HttpWebRequest 时，需要设置 ServicePointManager.DefaultConnectionLimit 数(默认连接数是 2)。

        //当多线程请求时，同时的连接数超过Limit时，GetResponse会抛出 Timeout WebException。

        ServicePointManager.DefaultConnectionLimit = ;

        response = (HttpWebResponse)request.GetResponse();

        Stream streamResponse = response.GetResponseStream();

        if (streamResponse != null)

        {

            using (StreamReader sr = new StreamReader(streamResponse))

            {

                responseDatas = sr.ReadToEnd();

            }

        }

        else

        {

            responseDatas = "{\"Code\":-1,\"Data\":\"[]\"}";

        }

    }

    finally

    {

        if (response != null)

        {

            try

            {

                response.Close();

            }

            catch

            {

                request.Abort();

            }

        }

    }

    return responseDatas;

}