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string username = "asdf1234" + % + "uname";
string completeurl = surl + accountname + @"/activities";            

            Uri address = new Uri(completeurl);
            Debug.WriteLine(completeurl);
            HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;
            request.Credentials = new NetworkCredential(username, pword);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";

            StringBuilder data = new StringBuilder();
            data.Append("activityType=" + HttpUtility.UrlEncode("SV_ADD", Encoding.UTF8));
            data.Append("&data=" + HttpUtility.UrlEncode("Email Address,Email Type,First Name,Last Name\n",Encoding.UTF8)); // +  + HttpUtility.UrlEncode("\n", Encoding.UTF8));
            data.Append("&lists=" + HttpUtility.UrlEncode(listurl)); //  + @"lists/1"));
            byte[] byteData = UTF8Encoding.UTF8.GetBytes(data.ToString());

            string st = String.Empty;

            // Set the content length in the request headers  
            request.ContentLength = byteData.Length;

            // Write data  
            using (Stream postStream = request.GetRequestStream())
            {
                postStream.Write(byteData, 0, byteData.Length);
            }

            // Get response  
            using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
            {                
                // Get the response stream  
                StreamReader reader = new StreamReader(response.GetResponseStream());
                st = reader.ReadToEnd();
            }

            return st;
        }

        public string[] retrieveLists(string accountname, string xpathselect)
        {
            string username = "asdf1234" + % + "uname";
            string completeurl = surl + accountname + @"/lists";

            List al = new List();

            if (xpathselect == String.Empty)
            {
                xpathselect = "//at:title|//at:id";
            }

            Uri address = new Uri(completeurl);
            Debug.WriteLine(completeurl);

            HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;
            request.Credentials = new NetworkCredential(username, pword);
            string st = String.Empty;

            using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
            {                

                // Get the response stream  
                StreamReader reader = new StreamReader(response.GetResponseStream());

                XmlTextReader xmlreader = new XmlTextReader(reader);

                XPathDocument doc = new XPathDocument(xmlreader);
                XPathNavigator pn = doc.CreateNavigator();

                XmlNamespaceManager ns = new XmlNamespaceManager(pn.NameTable);
                ns.AddNamespace("at", "http://www.w3.org/2005/Atom");
                ns.AddNamespace("cc", "http://ws.constantcontact.com/ns/1.0"); 

                XPathNodeIterator nodes = pn.Select(xpathselect,ns);

                bool bfirst = true;
                string stemp = String.Empty;

                while (nodes.MoveNext())                
                {
                    
                    // note. Don't attemp to use attributes. There aren't any....

                    XPathNavigator node = nodes.Current;

                    if (bfirst)
                    {
                        stemp = node.Value;
                        bfirst = false;
                    }
                    else
                    {
                        al.Add(stemp + "|" + node.Value);
                        stemp = String.Empty;
                        bfirst = true;
                    }
                }
                
            }

            return al.ToArray();
        }

  public string addNewList(string accountname, string listname)
        {

            string username = "asdf1234" + % + "uname";
            string completeurl = surl + accountname + @"/lists"; // collection uri
            
            Uri address = new Uri(completeurl);
            Debug.WriteLine(completeurl);
            HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;
            request.Credentials = new NetworkCredential(username, pword);
            request.Method = "POST";
            request.ContentType = @"application/atom+xml"; // key line

 StringBuilder data = new StringBuilder();
            data.Append(@"");
            data.Append(@"data:,");
            data.Append(@"