[C#] Dateinamen ohne Pfad & Endung?

string[] files = Directory.GetFiles("sites", "*.php");
using(StreamWriter phpWriter = new StreamWriter("index.php"))
{
	for (int i = 0; i < files.Length; i++)
	{
		phpWriter.WriteLine("<li><a href='index.php?site=" + files[i] + "'>" + files[i] + "</a></li>");
	}
}

<li><a href='index.php?site=sites\archiv.php'>sites\archiv.php</a></li>
<li><a href='index.php?site=sites\galerie.php'>sites\galerie.php</a></li>
<li><a href='index.php?site=sites\impressum.php'>sites\impressum.php</a></li>
<li><a href='index.php?site=sites\index.php'>sites\index.php</a></li>
<li><a href='index.php?site=sites\kontakt.php'>sites\kontakt.php</a></li>
<li><a href='index.php?site=sites\preise.php'>sites\preise.php</a></li>
<li><a href='index.php?site=sites\ueberuns.php'>sites\ueberuns.php</a></li>

<li><a href='index.php?site=archiv'>archiv</a></li>
<li><a href='index.php?site=galerie'>galerie</a></li>
<li><a href='index.php?site=impressum'>impressum</a></li>
<li><a href='index.php?site=index'>index</a></li>
<li><a href='index.php?site=kontakt'>kontakt</a></li>
<li><a href='index.php?site=preise'>preise</a></li>
<li><a href='index.php?site=ueberuns'>ueberuns</a></li>

string mainDir = Directory.GetCurrentDirectory() + @"\VisionBlog\";
string[] mainfiles = Directory.GetFiles(mainDir);
for(int i = 0; i < mainfiles.Length; i++)
{
	FileInfo toUpload = new FileInfo(mainfiles[i]);
	FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://" + this.txtServer.Text + "/" + toUpload.Name);
	request.Method = WebRequestMethods.Ftp.UploadFile;
	request.Credentials = new NetworkCredential(this.txtUser.Text, this.txtPw.Text);
	Stream ftpStream = request.GetRequestStream();
	FileStream file = File.OpenRead(mainfiles[i]);
	int length = 1024;
	byte[] buffer = new byte[length];
	int bytesRead = 0;
	do
	{
		bytesRead = file.Read(buffer, 0, length);
		ftpStream.Write(buffer, 0, bytesRead);
	}
	while (bytesRead != 0);
	file.Close();
	ftpStream.Close();
}

MessageBox.Show("Upload complete");