POST数据到指定url并返回结果页面内容

using System.Net;

using System.Collections.Specialized;

public string getPostBackStream(string rUrl)

{

 // Create a new WebClient instance.

 WebClient myWebClient = new WebClient();

 // Create a new NameValueCollection instance to hold

 // some custom parameters to be posted to the URL.

 NameValueCollection myNameValueCollection = new NameValueCollection();

 myNameValueCollection.Add("title","this is title");    

 myNameValueCollection.Add("url","http://www.zl5.info/tb_client.aspx");

 myNameValueCollection.Add("excerpt","this is excerpt");

 byte[] responseArray = myWebClient.UploadValues(rUrl,"POST",myNameValueCollection);

 return Encoding.ASCII.GetString(responseArray);

}