shopping cart issue

 hi from turkey well im trying to make a trade site. Ã?°ts almost done it has a shopping cart for unregistred users and another for registred users but for both of them ive got a problem.
 
fazla.aspx
 

Partial Class fazla2
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load



        Label5.Text = User.Identity.Name

        ID = Request.QueryString.Get(0)
        TextBox1.Text = Convert.ToString(ID)

        Dim c As New Data.OleDb.OleDbConnection
        c.ConnectionString = "provider=microsoft.jet.oledb.4.0;Data source=" + Server.MapPath("~\app_data\urun.mdb")
 &nb ...