C#POST数据，HttpWebRequest请求页面，HttpWebResponse返回数据

C#调用页面POST数据，并得到返回内容的代码：

 1 private string GetResponseData(byte[] postData)
 2         {
 3             HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create("http://XXX.XXX.XXX");
 4             myRequest.Method = "POST";
 5             myRequest.ContentType = "application/x-www-form-urlencoded";
 6             myRequest.ContentLength = postData.Length;
 7 
 8             Stream newStream = myRequest.GetRequestStream();
 9             // Send the data. 
10             newStream.Write(postData, 0, postData.Length);
11             newStream.Close();
12 
13             // Get response 
14             HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
15             StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.Default);
16             return reader.ReadToEnd();
17         }