//request请求
HttpWebRequest request = WebRequest.Create(serverUrl) as HttpWebRequest;
request.KeepAlive = false;
//post请求
request.Method = "POST";
//得到会话
HttpWebResponse response = request.GetResponse() as HttpWebResponse;
//得到请求返回的流
StreamReader reader = new StreamReader(response.GetResponseStream());
//读取流,得到数据
string result = reader.ReadToEnd();