Android C2DM Invalidregistration

I have created an android app, that registering to google c2dm service. And It's getting a registration_id token from c2dm services successfully.

I already signed Android Cloud to Device Messaging form and I received confirmation email from c2dm service.

Everything seems ok in client side, it's getting registration_id in simulator environment. So, it's ok.

But, On server side, It's authenticating google service, it's receiving Auth code then it's invoking to c2dm send url with below code.

  public void SendMessage(string registrationId, string data)
    {
        ServicePointManager.ServerCertificateValidationCallback += delegate(
                                            object sender,
                                            X509Certificate certificate,
                                            X509Chain chain,
                                            SslPolicyErrors sslPolicyErrors)
        {
            return true;
        };

        string collapseKey = Guid.NewGuid().ToString("n");          

        string url = "https://android.apis.google.com/c2dm/send";
        HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
        request.Method = "POST";
        request.Headers.Add("Authorization", "GoogleLogin auth=DQAAAKYAAACE_0NqG8Sj5lBf4YSPXs_ltQbTzPsAL5u1Q1KGF...");

        string px = "registration_id=" + registrationId + "&collapse_key=" + collapseKey + "&data.payload=" + data;
        string encoded = HttpUtility.UrlEncode(px);

        ASCIIEncoding encoding = new ASCIIEncoding();
        byte[] buffer = encoding.GetBytes(encoded);

        Stream newStream = request.GetRequestStream();
        newStream.Write(buffer, 0, buffer.Length);
        newStream.Close();




         HttpWebResponse response = (HttpWebResponse)request.GetResponse();
         if(response.StatusCode == HttpStatusCode.OK)
         {
             Stream resStream = response.GetResponseStream();
             StreamReader sr = new StreamReader(resStream);
             Console.Write(sr.ReadToEnd());
             sr.Close();
             resStream.Close();
         }
         Console.WriteLine();
         Console.ReadLine();
    }

It's still receiving Error=InvalidRegistration response from c2dm service.

What I'm doing wrong ?

Ok, It solved. I removed HttpUtility.UrlEncode(px); and everything worked as I expected.

Lewis

I had this problem for a long time until I set the ContentType to-