how send json data from c# to php

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C#

ASP.NET

JSON

I am trying to send json data from asp.net to php but code i which i am using is hitting urland getting server response but not sending data to server.

If data sent successfully, return message from server will be: Data reached
If data not sent successfully, return message from server will be: failed loading json data

i am getting second error when i am running my code. My code is below

protected void Button2_Click1(object sender, EventArgs e)
  
{
        
HttpWebRequest request=HttpWebRequest)WebRequest.Create("http://www.invoicera.com/testbeta/test.php");

        request.Method = "POST";
        request.ContentType = "application/json; charset=utf-8";
        string data = "{\"user\":\"test\",\"name\":\"xyz\"}";
        DataContractJsonSerializer ser = new DataContractJsonSerializer(data.GetType());
        MemoryStream ms = new MemoryStream();
        ser.WriteObject(ms, data);
        String json = Encoding.UTF8.GetString(ms.ToArray());
        StreamWriter writer = new StreamWriter(request.GetRequestStream());
        writer.Write(json);
        writer.Close();
        WebResponse response = request.GetResponse();
        // Get the stream containing content returned by the server.
        Stream dataStream = response.GetResponseStream();
        // Open the stream using a StreamReader for easy access.
        StreamReader reader = new StreamReader(dataStream);
        // Read the content.
        string responseFromServer = reader.ReadToEnd();
        // Display the content.
        Response.Write(responseFromServer);
        // Clean up the streams and the response.
        reader.Close();
        response.Close();
    }