GCM push notification get error like "Error=MissingRegistration"

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C#

public string SendNotification(string deviceId, string message)
{
    string GoogleAppID = "*************************************";
    var SENDER_ID = "******************";
    var value = message;
    WebRequest tRequest;
    tRequest = WebRequest.Create("https://android.googleapis.com/gcm/send");
    tRequest.Method = "post";
    tRequest.ContentType = " application/x-www-form-urlencoded;charset=UTF-8";
    tRequest.Headers.Add(string.Format("Authorization: key={0}", GoogleAppID));
    tRequest.Headers.Add(string.Format("Sender: id={0}", SENDER_ID));
    string postData = "collapse_key=score_update&time_to_live=108&delay_while_idle=1&data.message=" + value + "&data.time=" + System.DateTime.Now.ToString() + "®istration_id=" + deviceId + "";
    Console.WriteLine(postData);
    Byte[] byteArray = Encoding.UTF8.GetBytes(postData);
    tRequest.ContentLength = byteArray.Length;
    Stream dataStream = tRequest.GetRequestStream();
    dataStream.Write(byteArray, 0, byteArray.Length);
    dataStream.Close();
    WebResponse tResponse = tRequest.GetResponse();
    dataStream = tResponse.GetResponseStream();
    StreamReader tReader = new StreamReader(dataStream);
    String sResponseFromServer = tReader.ReadToEnd();
    tReader.Close();
    dataStream.Close();
    tResponse.Close();
    return sResponseFromServer;
}

please give answer if any one knows it

while implementing the gcm push notification with above code for android i got the error like Error=MissingRegistration

Thanks in Advance.