JSON - Slashes and application type .. refactoring

My code works (yes!) Which sends json to the server .. any refactoring thoughts will be appreciated

1) My C # code is sending this json to the server

{\ "Name \": \ "Bill \", \ "LastName \": \ "Gate \", \ "Email \": \ " asdf@hotmail.com \", \ "deviceUUID \": \ " ABVGDEZHZIKLMNOPRSTUFKHCHSHEYUYA \ "}

Which I have to get rid of the forward slashes on the server side .... not good.

2) I am using application / x-www-form-urlencoded and probably want to use application / json

Person p = new Person();
            p.firstName = "Bill";
            p.lastName = "Gates";
            p.email = "asdf@hotmail.com";
            p.deviceUUID = "abcdefghijklmnopqrstuvwxyz";

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(targetUri + "newuser.php");
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            //TODO request.ContentType = "application/json";

            JavaScriptSerializer serializer = new JavaScriptSerializer();
            string s = serializer.Serialize(p);
            textBox3.Text = s;

            string postData = "json=" + HttpUtility.UrlEncode(s);

            byte[] byteArray = Encoding.ASCII.GetBytes(postData);

            request.ContentLength = byteArray.Length;
            Stream dataStream = request.GetRequestStream();
            dataStream.Write(byteArray, 0, byteArray.Length);
            dataStream.Close ();

            WebResponse response = request.GetResponse();
            //textBox4.Text = (((HttpWebResponse)response).StatusDescription);
            dataStream = response.GetResponseStream ();

            StreamReader reader = new StreamReader(dataStream);
            string responseFromServer = reader.ReadToEnd ();
            textBox4.Text += responseFromServer;

            reader.Close ();
            dataStream.Close ();
            response.Close ();

      

        
        
        
      

    

PHP code on server:

$inbound = $_POST['json'];

// this strips out the \
$stripped = stripslashes($inbound);

$json_object = json_decode($stripped);
echo $json_object->{'firstName'};
echo $json_object->{'lastName'};
echo $json_object->{'email'};
echo $json_object->{'deviceUUID'};