程序post

            ASCIIEncoding encoding = new ASCIIEncoding();
            string postData = "srh_type=0";
            postData += "&cityid=0101";
            postData += "&price=-1";
            postData += "&star=-1";

            postData += "&__EVENTTARGET=Search1$Pager";
            postData += "&__EVENTARGUMENT=1";



            byte[] data = encoding.GetBytes(postData);

            // Prepare web request
            HttpWebRequest myRequest =
            (HttpWebRequest)WebRequest.Create("http://**");

            myRequest.Method = "POST";
            myRequest.ContentType = "application/x-www-form-urlencoded";
            myRequest.ContentLength = data.Length;
            Stream newStream = myRequest.GetRequestStream();

            // Send the data.
            newStream.Write(data, 0, data.Length);
            newStream.Close();

            // Get response
            HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
            StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.Default);
            string content = reader.ReadToEnd();
            Response.Write(content);