Create a directory using C# as client to a PHP server

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;


namespace createdirectory
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                string url = "http://##############/####.php";
                string str = "DirectoryaName"; ;
                HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
                req.Method = "POST";
                string Data = "message=" + str;
                byte[] postBytes = Encoding.ASCII.GetBytes(Data);
                req.ContentType = "application/x-www-form-urlencoded";
                req.ContentLength = postBytes.Length;
                Stream requestStream = req.GetRequestStream();
                requestStream.Write(postBytes, 0, postBytes.Length);
                requestStream.Close();
                HttpWebResponse response = (HttpWebResponse)req.GetResponse();
                Stream resStream = response.GetResponseStream();
                var sr = new StreamReader(response.GetResponseStream());
                string responseText = sr.ReadToEnd();


            }
            catch (WebException)
            {

                MessageBox.Show("Please Check Your Internet Connection");
            }
           
          
   
}
        }
    }
//and this is your php code to create directory 
on php server


<?php 
    if (isset($_POST['message']))
    {
        $msg = $_POST['message'];        
        mkdir($msg);}
   ?>