C# - Binärdatei aus XML Datei auslesen und abspeichern

/// <summary>
/// Read a XML file including a binary file and create the binary file.
/// </summary>
/// <param name="pathBinary"></param>
/// <param name="pathXML"></param>
private void XMLToBinary(string pathBinary, string pathXML)
{            
    int readBytes = 0;
    byte[] buffer = new byte[1000];
    FileStream fileStream = new FileStream(pathBinary, FileMode.OpenOrCreate, FileAccess.Write, FileShare.Write);
    BinaryWriter binaryWriter = new BinaryWriter(fileStream);

    XmlReader xmlReader = XmlReader.Create(pathXML);
    xmlReader.ReadToFollowing("BinaryFile");
    while ((readBytes = xmlReader.ReadElementContentAsBase64(buffer, 0, 50)) > 0)
    {
        binaryWriter.Write(buffer, 0, readBytes);
    }
    fileStream.Close();
    xmlReader.Close();
}