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1。第一中不用说了。使用vs.net提供的工具，生成代理类。

2。使用webrequest的方法。

public static XmlDocument XmlSendByHttp(string xmlString, string url, string SoapAction)
        {
            XmlDocument outxml = new XmlDocument();
            Stream oWriter = null;
            bool bResult = true;
            byte[] data = Encoding.UTF8.GetBytes(xmlString);
            HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(url);

            myRequest.Method 

= "POST";
            myRequest.Headers.Add("SOAPAction", SoapAction);    
            myRequest.Headers.Add("ContentLength", data.Length.ToString());
            myRequest.ContentType = "text/xml; charset=utf-8";try
            {
                oWriter = myRequest.GetRequestStream();
                oWriter.Write(data, 0, data.Length);
                oWriter.Close();
            }
            catch
            {
                oWriter.Close();
                bResult = false;
            }

            Stream oReader 

= null;
            if (bResult)
            {
                try
                {
                    HttpWebResponse oResponse = (HttpWebResponse)myRequest.GetResponse();
                    oReader = oResponse.GetResponseStream();
                    outxml.Load(oReader);
                    oReader.Close();
                }
                catch
                {
                }
            }
            return outxml;
        }