ASP.NET sayfa yönlendirme sorunu

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

namespace siteurun
{
    public partial class urundetay : System.Web.UI.Page
    {
        esqlbaglantisi baglan = new esqlbaglantisi();

        string urunID = "";


        protected void Page_Load(object sender, EventArgs e)
        {
            urunID = Request.QueryString["urunID"];
        

            //Slider Sorgusu

            SqlCommand cmds = new SqlCommand("Select * from Resim where urunID='" + urunID + "'", baglan.baglan());
            SqlDataReader drs = cmds.ExecuteReader();

            dl_slider.DataSource = drs;
            dl_slider.DataBind();

              //Ürün Başlık

            SqlCommand cmdbaslik = new SqlCommand("SELECT * from Urun where urunID='" + urunID + "'", baglan.baglan());
            SqlDataReader drbaslik = cmdbaslik.ExecuteReader();

            dl_baslik.DataSource = drbaslik;
            dl_baslik.DataBind();