State Management :: Manage Custom Objects And Session State?

I've created a whole bunch of rather complex classes and now i'm starting to work on the ASP.net user interface. Basically the user will open 1 page which will be used to load, edit, save an object. The object has many fields and they are often other classes i've created. To create a nice interface i've used popups and used AJAX to reload parts of the page to avoid reloading the whole thing.

My plan was to create the object and save it to the session. Then each time the page is loaded copy the object values to the asp fields and do the reverse when the page has been submitted copying the asp values to the object field then updating the session object.

So the code will go something like:

onload:

if session is not null load from session otherwise create new
this.txtID.text = object.id
this.txtName.text = object.name
etc etc

on submit:

object.id = this.txtID.text
object.name = this.txtName.text
etc etc
update session.

Is this what you guys would do? or am i over thinking this, seems like a lot of code to load all the object fields each time the page is opened and submitted etc.

Just looking to bounce ideas of off other developers :D