Stream in Datei umleiten

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private static void StreamToFile(Stream inputStream, string outputFile, FileMode fileMode)
{
    if (inputStream == null)
        throw new ArgumentNullException("inputStream");

    if (String.IsNullOrEmpty(outputFile))
        throw new ArgumentException("Argument null or empty.", "outputFile");

    using (FileStream outputStream = new FileStream(outputFile, fileMode, FileAccess.Write))
    {
        int cnt = 0;
        const int LEN = 4096;
        byte[] buffer = new byte[LEN];

        while ((cnt = inputStream.Read(buffer, 0, LEN)) != 0)
            outputStream.Write(buffer, 0, cnt);
    }
}