Pretty URLs, Separation of Layers and O/R Mapping in Web Forms ASP.NET 2.0

using System;

using System.Collections.Generic;
using System.Collections.Specialized;
using System.Web.UI.WebControls;

using MVC.Models;
using NHibernate.MapClasses;
using MVC.Controllers;

public partial class Controllers_Store_checkout : System.Web.UI.Page, MVC.Views.IGeneralView
{

    private MVC.Controllers.IStoreController _controller;
    public delegate Order SingleOrder_delegate();

    public void Alert(string message)
    {
        notice.Text = message;
    }

    protected void Page_Load(object sender, EventArgs e)
    {

        _controller = MVC.Factories.Factory.PointerToFactory.GetStoreController(this); 

        if (!IsPostBack) //on GET we need ampty Order for DS in edit mode
        {
            ODS_CheckOut.TypeName = _controller.GetType().FullName;
            SingleOrder_delegate GiveMethodName = new SingleOrder_delegate(_controller.SingleOrder);
            ODS_CheckOut.SelectMethod = GiveMethodName.Method.Name;
            OrderForm.DataSourceID = ODS_CheckOut.ID;
        }
    }

    protected void ODS_CheckOut_ObjectCreating(object sender, ObjectDataSourceEventArgs e)
    {
        e.ObjectInstance = _controller;                //gets current _controller instance

    }

    protected void ODS_CheckOut_ItemUpdating(object sender, DetailsViewUpdateEventArgs e)
    {
        DropDownList DrDl_PayTypeList = (DropDownList)OrderForm.FindControl("PayTypeList");
        string selection = DrDl_PayTypeList.SelectedItem.ToString();
        
        e.NewValues.Add("Pay_Type", selection);

        List<CartMember> SessionList =
                        (List<CartMember>)Session["cart"];

        // we pass by ref to be sure that shopping cart is 
        //passed by reference
        if (SessionList != null)
            _controller.CreateOrder(e.NewValues, ref SessionList);
        else
            Alert("Error: Cart is empty!");

        e.Cancel = true;
       
    }

   
}