c#/ASP.NET向百度站长平台主动推送URL

public static bool PushToBaiduZZ(string url)
{
try
{
using (var db = new Db.DataContext())
{
var m = db.Configs.FirstOrDefault(f => f.Key == "BaiduPushUrl");
if (m == null)
{
return false;
}
string BaiduPushUrl = m.Value;
//string.Format(BaiduPushUrl, url)
//urlPage += ">type=original";
Stream outstream = null;
Stream instream = null;
StreamReader sr = null;
HttpWebResponse response = null;
HttpWebRequest request = null;
Encoding encoding = Encoding.GetEncoding("GBK");
byte[] data = encoding.GetBytes(url);
request = WebRequest.Create(BaiduPushUrl) as HttpWebRequest;
request.Method = "POST";
request.ContentType = "text/plain";
request.ContentLength = data.Length;
outstream = request.GetRequestStream();
outstream.Write(data, 0, data.Length);
outstream.Flush();
outstream.Close();
response = request.GetResponse() as HttpWebResponse; //直到request.GetResponse()程序才开始向目标网页发送Post请求
instream = response.GetResponseStream();
sr = new StreamReader(instream, encoding); //返回结果网页(html)代码
string content = sr.ReadToEnd();//通过内容判断是否成功，成功的内容包括了success
instream.Flush();
instream.Close();
sr.Close();
return true;
}
}
catch (Exception)
{
return false;
}