Okay, we have a PHP script that creates an download link from a file and we want to download that file via C#. This works fine with progress etc but when the PHP page gives an error the program downloads the error page and saves it as the requested file. Here is the code we have atm:

PHP Code:

<?php
$path = 'upload/test.rar';

    if (file_exists($path)) {
        $mm_type="application/octet-stream";
        header("Pragma: public");
        header("Expires: 0");
        header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
        header("Cache-Control: public");
        header("Content-Description: File Transfer");
        header("Content-Type: " . $mm_type);
        header("Content-Length: " .(string)(filesize($path)) );
        header('Content-Disposition: attachment; filename="'.basename($path).'"');
        header("Content-Transfer-Encoding: binary\n");
        readfile($path); 
        exit();
    } 
    else {
    print 'Sorry, we could not find requested download file.';
    }
?>

C# Code:

private void btnDownload_Click(object sender, EventArgs e)
    {
        string url = "http://***.com/download.php";
        WebClient client = new WebClient();
        client.DownloadFileCompleted += new AsyncCompletedEventHandler(client_DownloadFileCompleted);
        client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgressChanged);
        client.DownloadFileAsync(new Uri(url), @"c:\temp\test.rar");
    }

    private void ProgressChanged(object sender, DownloadProgressChangedEventArgs e)
    {
        progressBar.Value = e.ProgressPercentage;
    }

    void client_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
    {
            MessageBox.Show(print);
    }