gistfile1.cpp

private string Post(string username, string password, string url, string xml)
    {
        string basicAuth = Convert.ToBase64String(Encoding.ASCII.GetBytes(String.Format("{0}:{1}", username, password)));

        //create the web request
        WebRequest request = WebRequest.Create(url);
        request.Proxy.Credentials = System.Net.CredentialCache.DefaultCredentials;
        request.Headers.Add("Authorization", "Basic " + basicAuth);
        request.ContentType = "application/xml";
        request.ContentLength = xml.Length;
        request.Method = "POST";

        //get the request stream
        Stream stream = request.GetRequestStream();

        //convert the xml to an array of bytes
        System.Text.Encoding enc = System.Text.Encoding.ASCII;
        byte[] xmlArray = enc.GetBytes(xml);

        //write the array to the request straem
        stream.Write(xmlArray, 0, xmlArray.Length);

        //get the response
        WebResponse response = request.GetResponse();

        StreamReader reader = new StreamReader(response.GetResponseStream());

        return reader.ReadToEnd();

    }