How to deep copy a class without marking it as Serializable

Question

Given the following class:

class A
{
    public List ListB;

    // etc...
}

where B is another class that may inheri

Answer 1

An answer from a different thread that using json serialization is the best I've seen.

public static T CloneJson<T>(this T source)
{      
    if (Object.ReferenceEquals(source, null))
    {
        return default(T);
    }    
    return JsonConvert.DeserializeObject<T>(JsonConvert.SerializeObject(source));
}