ASP.NET Page Navigation Using Workflow 4.0

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

namespace BostonDealer
{
    public partial class HomePage : BasePage
    {
        protected void Page_Init(object sender, EventArgs e)
        {
            if (!IsPostBack)
                Session["Customer"] = null;

        }
        protected void Page_Load(object sender, EventArgs e)
        {
          
        }

        protected void btnNext_Click(object sender, EventArgs e)
        {
            customer.vehicle.VehicleType = RadioButtonList1.SelectedValue;
            GotoNextPage();
        }
    }
}