[Serializable]
public class Foo
{
    public int nTotal { set; get; }
    public Guid g1 { set; get; }
    public string name { set; get; }
    public byte[] byArray { set; get; }
}

class Program
{
    static void Main(string[] args)
    {
        byte[] result;
        var foo = new Foo()
        {
            nTotal = 100,
            g1 = Guid.NewGuid(),
            name = "My Name is Jon Cena",
            byArray = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }
        };
        var formatter = new BinaryFormatter();
        using (var stream = new MemoryStream())
        {
            formatter.Serialize(stream, foo);
            result = stream.ToArray();
        }
        using (var stream = new MemoryStream(result))
        {
            var bar = formatter.Deserialize(stream);
        }
    }
}