1.Updater.php

<?php

$data = array();

//This is an associative array with named keys as indexes

$data['Version'] = '1.0.0.0';
$data['Hash'] = '85f6ee768c10f9c09931a6ae2a94a395';
$data['Addition'] = 'Implemented multi threading, remove redundant code';
$data['Link'] = '/update/myapp.exe';

echo json_encode($data);

?>

2.Update.cs

//Created using http://json2csharp.com/

public class Update
{
    public string Version { get; set; }
    public string Hash { get; set; }
    public string Addition { get; set; }
    public string Link { get; set; }
}

3.Program.cs

//Use 
// https://gist.github.com/PatPositron/10076559
// For the JSON Library

private static void Main(string[] args)
{
    Update updateData;
    
    using (var wc = new WebClient())
    {
        string response = wc.DownloadString("mywebsite.com/updater.php");
        updateData = JsonUtil.Deserialize<Update>(response);
    }
    
    Console.WriteLine(updateData.Version);
    Console.WriteLine(updateData.Hash)
}