gistfile1.cs

static void Main(string[] args)
        {
            Console.ReadLine();

            //Create a Web-Request to an URL
            HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create("http://demowebservice.suedtirol.info/service/MOBILEListener");

            //Defined poperties for the Web-Request
            httpWebRequest.Method = "POST";
            httpWebRequest.MediaType = "HTTP/1.1";
            httpWebRequest.ContentType = "text/xml";
            httpWebRequest.UserAgent = "Example Client";

            //Defined data for the Web-Request
            byte[] byteArrayData = Encoding.ASCII.GetBytes("method=DocServiceCategorySearch&user=Raysono&pass=PASS&Parameter=" + System.Net.WebUtility.UrlEncode("<Sinfonet><Query><MetaInfo name=\"DocType\" compareMode=\"EQ\">VinaryCustomList</MetaInfo><MetaInfo name=\"DocOwner\" compareMode=\"EQ\">4D84730B51A349FFB68D2140C14456EE</MetaInfo><MetaInfo name=\"DocLang\" compareMode=\"EQ\">DE</MetaInfo></Query><Page number=\"1\" items=\"25\" /><Output dataType=\" * \" dataContext=\" * \" /></Sinfonet>"));
            httpWebRequest.ContentLength = byteArrayData.Length;

            //Attach data to the Web-Request
            Stream dataStream = httpWebRequest.GetRequestStream();
            dataStream.Write(byteArrayData, 0, byteArrayData.Length);
            dataStream.Close();

            //Send Web-Request and receive a Web-Response
            HttpWebResponse httpWebesponse = (HttpWebResponse)httpWebRequest.GetResponse();

            //Translate data from the Web-Response to a string
            dataStream = httpWebesponse.GetResponseStream();
            StreamReader streamreader = new StreamReader(dataStream, Encoding.UTF8);
            string response = streamreader.ReadToEnd();
            streamreader.Close();

            Console.WriteLine(response.ToString());

            Console.ReadLine();
        }