winfrom post 向服务器请求数据

1. public void PostMoths()  
2.         {  
3.             string strURL = "http://www.cqjg.gov.cn/newwww/c7/clwz.asp";  
4.             System.Net.HttpWebRequest request;  
5.             request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);  
6.             //Post请求方式  
7.             request.Method = "POST";  
8.             //内容类型  
9.             request.ContentType = "application/x-www-form-urlencoded";  
10.             //参数经过URL编码  
11.             string paraUrlCoded = System.Web.HttpUtility.UrlEncode("LicenseTxt");  
12.             paraUrlCoded += "=" + System.Web.HttpUtility.UrlEncode(txtCarId .Text.Trim());  
13.             paraUrlCoded +="& "+ System.Web.HttpUtility.UrlEncode("VIN");  
14.             paraUrlCoded += "=" + System.Web.HttpUtility.UrlEncode(txtCarNumber.Text.Trim());  
15.             byte[] payload;  
16.             //将URL编码后的字符串转化为字节  
17.             payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);  
18.             //设置请求的ContentLength   
19.             request.ContentLength = payload.Length;  
20.             //获得请求流  
21.             Stream writer = request.GetRequestStream();  
22.             //将请求参数写入流  
23.             writer.Write(payload, 0, payload.Length);  
24.             //关闭请求流  
25.             writer.Close();  
26.             System.Net.HttpWebResponse response;  
27.             //获得响应流  
28.             response = (System.Net.HttpWebResponse)request.GetResponse();  
29.             System.IO.Stream s;  
30.             s = response.GetResponseStream();  
31.             string StrDate = "";  
32.             string strValue = "";  
33.             StreamReader Reader = new StreamReader(s,Encoding.Default);  
34.             while ((StrDate= Reader.ReadLine())!=null)  
35.             {  
36.                 strValue += StrDate+"\r\n";  
37.             }  
38.             // txtInfo.Text = strValue;  
39.             txtInfo.Text= FindContent(strValue);  
40.             //XmlTextReader Reader = new XmlTextReader(s);  
41.             //Reader.MoveToContent();  
42.             //string strValue = Reader.ReadInnerXml();  
43.             //strValue = strValue.Replace("<", "<");  
44.             //strValue = strValue.Replace(">", ">");  
45.             //MessageBox.Show(strValue);  
46.             //Reader.Close();  
47.         }