unable to get all the data display checked in datalist.

I have a datalist which contain product catagory with unique ID asign to every products in my catalog. However, when i checked 2 or more checkboxes, i will only get the latest data display next page, but not all the data displayed. Just 1 data displayed only. Is there any way i can do so that I can pass 3 different ID at a time and display on nxt page?

  void GetCheckedBox()
{


    foreach (DataListItem li in DataList1.Items)
    {

        //access the check checklist
        HtmlInputCheckBox cb = li.FindControl("FavChkBox") as HtmlInputCheckBox;
        if (cb != null && cb.Checked)
        {
            ArrayList Product = new ArrayList();

            LblText.Text += " , ";

            LblText.Text += cb.Value;
            Product.Add(cb.Value);
            string url = "CompareProducts.aspx?prodId=" + cb.Value.ToString();
            Response.Redirect(url);
        }



    }
}

CompareProducts.aspx.cs

           protected void Page_Load(object sender, EventArgs e)
{

    if (!IsPostBack)
    {


            Product aProd = new Product();


            SqlConnection con = new SqlConnection(strcon);
            SqlCommand cmd = new SqlCommand("SELECT * FROM Products WHERE Product_ID = @ProdID", con);
            SqlDataAdapter adp = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            cmd.Parameters.AddWithValue("@ProdID", Page.Request.QueryString["ProdID"].ToString());
            con.Open();
            adp.Fill(ds, "Products");
            cmd.ExecuteNonQuery();
            con.Close();
            GridView1.DataSource = ds;
            GridView1.DataBind();
          DataList1.DataSource = ds;
       DataList1.DataBind();

        }