use query string in multi page

Hi

I have 2 page index.aspx   and  store .aspx

In index.aspx I have 1TextBox  and  1Button  when user enter their behcode in TB and click on Button it go to store.aspx page and fill this page with that user information

 1-index.aspx

    protected void ImageButton3_Click(object sender, ImageClickEventArgs e)
    {

 
        Response.Redirect("Store.aspx?behcode=" + Server.UrlEncode(txtNumeric.Text));
     


    }

2-store.aspx

  protected void Page_Load(object sender, EventArgs e)
    {
        string data = Server.UrlDecode(Request.QueryString["behcode"]);
     
        SqlCommand _cmd = new SqlCommand("storeproduct", _cn);
        _cmd.CommandType = CommandType.StoredProcedure;
        _cmd.Parameters.AddWithValue("@BehCode", data);
       
            _cn.Open();
            SqlDataReader _dr = _cmd.ExecuteReader();
            if(_dr.HasRows)
            {
                DataList1.DataSource = _dr;
                DataList1.DataBind();
                
                
             
            }

            _cn.Close();
        

        }

3-users table

In store.aspx I have 2 button when user click on each of them  it go to especial page

Button1=aboutus.aspx   button2=article.aspx   

Now I want when user enter their behcode in index.aspx and  according to that behcode go to store.aspx and see their page when they click one of 2 button in store.aspx they go to article or about us page and in  that page again fill with them information from user’s table according to behcode that they entered in index.aspx page.

how i can do it?

thanks alot