C# 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://test.mending.cn/tb_client.aspx");myNameValueCollection.Add("excerpt","this is excerpt");byte[] responseArray = myWebClient.UploadValues(rUrl,"POST",myNameValueCollection);return Encoding.ASCII.GetString(responseArray);}