asp.net http post接口的问题？
protected void btnLoad_Click(object sender, EventArgs e)
{
//入口地址为：http://125.208.3.12:8888/sms.aspx
string url="http://125.208.3.12:8888/sms.aspx?action=overage&userid=1152&account=111&password=111";
Response.ClearContent();
Response.Write(Post(urll));
Response.End();
}


public string Post(string url)
{
string returnData = null;
try
{
HttpWebRequest webReq = (HttpWebRequest)WebRequest.Create(url);
webReq.Method = "POST";
webReq.ContentType = "application/x-www-form-urlencoded";
Stream postData = webReq.GetRequestStream();
postData.Close();
HttpWebResponse webResp = (HttpWebResponse)webReq.GetResponse();
Stream answer = webResp.GetResponseStream();
StreamReader answerData = new StreamReader(answer);
returnData = answerData.ReadToEnd();

}
catch (Exception ex)
{
Response.Write(ex.Message);
}
return returnData.Trim()+"\n";
}
现在的问题是它return是xml形式的string，我怎样得到它标签里边的值？还有如果post(string url)的url改为入口地址,那参数怎么办,这方法又该怎么写？小生不才,望同业好手指点迷经，小弟在线等..


[解决办法]

C# code

byte[] byts = new byte[Request.InputStream.Length];            Request.InputStream.Read(byts, 0, byts.Length);            string req = System.Text.Encoding.UTF8.GetString(byts);             XmlDocument xml = new XmlDocument();            Response.ContentEncoding = System.Text.Encoding.UTF8;            Response.ContentType = "text/xml ";            xml.LoadXml(req);            XmlNodeList topm = xml.DocumentElement.ChildNodes;            foreach (XmlElement element in topm)            {                if (element.Name.ToLower() == "row")                {                    //得到该节点的子节点                    XmlNodeList nodelist = element.ChildNodes;                    if (nodelist.Count > 0)                    {                        foreach (XmlNode el in nodelist)//读元素值                        {                                                    }                    }           }     }