php and c# connection

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.IO;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            
            HttpWebRequest httpWReq =
    (HttpWebRequest)WebRequest.Create("http://localhost/m.php");

ASCIIEncoding encoding = new ASCIIEncoding();
string postData =textBox1.Text;
byte[] data = encoding.GetBytes(postData);

httpWReq.Method = "POST";
httpWReq.ContentLength = data.Length;

using (Stream newStream = httpWReq.GetRequestStream())
{
    newStream.Write("postData");
}
        }
    }
}

$con = mysql_connect("localhost","root","");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

mysql_select_db("data", $con);

$sql="INSERT INTO Persons (Name)
VALUES
('$_POST[httpWReq]')";

if (!mysql_query($sql,$con))
  {
  die('Error: ' . mysql_error());
  }
echo "1 record added";

mysql_close($con);
?>

$sql="INSERT INTO Persons (Name)
VALUES
('$_POST[httpWReq]')";