C# File POST Request for PHP Script

[Avante]

There's a program that occasionally creates a file log (log.txt) that should be sent to the php for preservation. There's a working option for html. We only need the same on C#.

Code html:

<form action="http://site.ru/in.php" method="post" enctype="multipart/form-data">

Code php:

<?php if(is_uploaded_file($_FILES["pass_file"]["tmp_name"])){
 move_uploaded_file($_FILES["pass_file"]["tmp_name"], "files/".$_FILES["pass_file"]["name"]);
 echo "OK";} else {
  echo("ERROR");?>

My knowledge C# ends with this:

C#

 WebRequest send = WebRequest.Create("http://site.ru/in.php");
 send.Method = "POST";
 send.ContentType = "multipart/form-data";

I tried that:

WebClient wc = new WebClient();
var send = wc.UploadFile("http://site.ru/in.php", "POST", @"C:\Programm\log.txt");

[juvenalb]

using (var client = new System.Net.WebClient())
{
    client.UploadFile("http://site/upload.php", @"c:\some\file.txt");
}