Facade Pattern For Asp.net Mvc Application

I have an MVC2 application with the following classes:

-OrderModel
-LineOrderModel
-OrderController
-LineOrderController

In the OrderController class I'm recollecting some values of a web form . Until now, I created instances of each order line (LineOrderModel class) and OrderClass inside of the Controller.

I was trying to create a OrderFacade class in order to encapsulate the different things to do when creating an order.

So in that class I created a method like this:

public void saveOrder(int idProvider,decimal? price)
{
// Here I create instances of OrderModel and LineOrderModel
// and assign their properties
}

but my problem is I don't know how to pass all the order lines captured from the web form.

I think it doesn't make sense to create and pass to that method a List with orderLines class (because the point of this is to operate with the Facade, not with the class directly)

How could I encapsulate the different lines (all with properties like numberUnits,idProduct ...) into a List of generic objects, each one with these properties?

Maybe something like a List<List<object>> ?