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How to deep copy an entity

public static T DeepClone<T>(this T obj)

    {

        using (var ms = new MemoryStream()) {

            var bf = new BinaryFormatter();

            bf.Serialize(ms, obj);

            ms.Position = 0;

            return (T)bf.Deserialize(ms);

        }

    }

       

db.Detach(myEntity);

myEntity.EntityKEy = null;

Entity newEntity = new Entity();

newEntity = DeepClone<Entity>(Entity);

db.Entities.AddObject(newEntity);

db.SaveChanges();

       

Entity newEntity = new Entity();

Eneity Entity = db.Include("ChildEntity").Where(p=>p.Id==Id).Single();

newEntity = DeepClone<Entity>(Entity);

db.Detach(myEntity);

myEntity.EntityKEy = null;

db.Entities.AddObject(newEntity);

db.SaveChanges();

       

var entity = db.Entities.Include("ChildEntity.ChildChildEntity")

        .Where(l=>l.ID == myId).Single();

       

Entity oldEntity = db.Include("ChildEntity").Where(p => p.Id == Id).Single();

Entity newEntity = oldEntity.DeepClone(); // assuming you've put your DeepClone extension method in a static class so that it can be used as an extension

newEntity.EntityKey = null;

foreach(var childEntity in newEntity.ChildEntities)

{

    childEntity.EntityKey = null;

}

db.Entities.AddObject(newEntity);

db.SaveChanges();