ASP.NET POST方式提交数据！

string url = "网址";

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);

string s = "要提交的数据";

byte[] requestBytes = System.Text.Encoding.ASCII.GetBytes (LoginInfo);

req.Method = "POST";

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

req.ContentLength = requestBytes.Length;

Stream requestStream = req.GetRequestStream();

requestStream.Write(requestBytes,0,requestBytes.Length);

requestStream.Close();

HttpWebResponse res = (HttpWebResponse)req.GetResponse();

StreamReader sr = new StreamReader(res.GetResponseStream(), System.Text.Encoding.Default);

string backstr = sr.ReadToEnd();

Response.Write(line);

sr.Close();

res.Close();