[C#] Bestanden downloaden van ftp server

private void btnConnect_Click(object sender, EventArgs e)
{
    //Hier verbinding maken met de FTP en de map selecteren
    lblFolder.Text = "";//Geselecteerde folder van je FTP
}

private void btnIndexeer_Click(object sender, EventArgs e)
{
    Bereken(lblFolder.Text);
}

private void Bereken(string folderPad)
{
    DirectoryInfo info = new DirectoryInfo(folderPad);
    foreach (FileInfo rootFile in info.GetFiles())
    {
        //Bestanden kopieren
        //Met info.Name haal je de naam van de folder op
        //Je kan dan tijdens het kopieren ook een nieuwe map aanmaken
        //om dan deze bestanden in te plaatsen
    }

    BerekenSubFolders(folderPad);
}

private void BerekenSubFolders(string folderPad)
{
    DirectoryInfo dirInfo = new DirectoryInfo(folderPad);
    foreach (DirectoryInfo subDir in dirInfo.GetDirectories())
    {
        foreach (FileInfo subFile in subDir.GetFiles())
        {
            //zelfde kopieerwerk als hierboven
        }
        BerekenSubFolders(subDir.FullName);
    }
}

private void btnConnect_Click(object sender, EventArgs e)
{
    //Hier verbinding maken met de FTP en de map selecteren
    lblFolder.Text = "";//Geselecteerde folder van je FTP
}
 
private void btnIndexeer_Click(object sender, EventArgs e)
{
    Bereken(lblFolder.Text);
}
 
private void Bereken(string folderPad)
{
    DirectoryInfo info = new DirectoryInfo(folderPad);
    foreach (FileInfo rootFile in info.GetFiles())
    {
        //Bestanden kopieren
        //Met info.Name haal je de naam van de folder op
        //Je kan dan tijdens het kopieren ook een nieuwe map aanmaken
        //om dan deze bestanden in te plaatsen
    }
 
    BerekenSubFolders(folderPad);
}
 
private void BerekenSubFolders(string folderPad)
{
    DirectoryInfo dirInfo = new DirectoryInfo(folderPad);
    foreach (DirectoryInfo subDir in dirInfo.GetDirectories())
    {
        foreach (FileInfo subFile in subDir.GetFiles())
        {
            //zelfde kopieerwerk als hierboven
        }
        BerekenSubFolders(subDir.FullName);
    }
}

public string[] GetFileList()
{
    string[] downloadFiles;
    StringBuilder result = new StringBuilder();
    FtpWebRequest reqFTP;
    try
    {
        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(
                  "ftp://" + ftpServerIP + "/"));
        reqFTP.UseBinary = true;
        reqFTP.Credentials = new NetworkCredential(ftpUserID, 
                                                   ftpPassword);
        reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;
        WebResponse response = reqFTP.GetResponse();
        StreamReader reader = new StreamReader(response
                                        .GetResponseStream());
        
        string line = reader.ReadLine();
        while (line != null)
        {
            result.Append(line);
            result.Append("\n");
            line = reader.ReadLine();
        }
        // to remove the trailing '\n'
        result.Remove(result.ToString().LastIndexOf('\n'), 1);
        reader.Close();
        response.Close();
        return result.ToString().Split('\n');
    }
    catch (Exception ex)
    {
        System.Windows.Forms.MessageBox.Show(ex.Message);
        downloadFiles = null;
        return downloadFiles;
    }
}
        

public string[] GetFileList()
{
    string[] downloadFiles;
    StringBuilder result = new StringBuilder();
    FtpWebRequest reqFTP;
    try
    {
        reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(
                  "ftp://" + ftpServerIP + "/"));
        reqFTP.UseBinary = true;
        reqFTP.Credentials = new NetworkCredential(ftpUserID, 
                                                   ftpPassword);
        reqFTP.Method = WebRequestMethods.Ftp.ListDirectory;
        WebResponse response = reqFTP.GetResponse();
        StreamReader reader = new StreamReader(response
                                        .GetResponseStream());
 
        string line = reader.ReadLine();
        while (line != null)
        {
            result.Append(line);
            result.Append("\n");
            line = reader.ReadLine();
        }
        // to remove the trailing '\n'
        result.Remove(result.ToString().LastIndexOf('\n'), 1);
        reader.Close();
        response.Close();
        return result.ToString().Split('\n');
    }
    catch (Exception ex)
    {
        System.Windows.Forms.MessageBox.Show(ex.Message);
        downloadFiles = null;
        return downloadFiles;
    }
}