public static void WriteCookiesToDisk(string file, CookieContainer cookieJar)

{

    using(Stream stream = File.Create(file))

    {

        try {

            Console.Out.Write("Writing cookies to disk... ");

            BinaryFormatter formatter = new BinaryFormatter();

            formatter.Serialize(stream, cookieJar);

            Console.Out.WriteLine("Done.");

        } catch(Exception e) {

            Console.Out.WriteLine("Problem writing cookies to disk: " + e.GetType());

        }

    }

}     

public static CookieContainer ReadCookiesFromDisk(string file)

{

    try {

        using(Stream stream = File.Open(file, FileMode.Open))

        {

            Console.Out.Write("Reading cookies from disk... ");

            BinaryFormatter formatter = new BinaryFormatter();

            Console.Out.WriteLine("Done.");

            return (CookieContainer)formatter.Deserialize(stream);

        }

    } catch(Exception e) {

        Console.Out.WriteLine("Problem reading cookies from disk: " + e.GetType());

        return new CookieContainer();

    }

}