redirect in ajax callback

$(document).ready(function () {

            var ajaxUrl = "fetchcustomer.aspx";

            $("#Logbutton").click(function () {



                $.ajax({
                    type: "POST", //GET or POST or PUT or DELETE verb /* Tim hieu xem tai sao khng duoc */
                    url: ajaxUrl, // Location of the service

                    data: { ID: $('#TextBox1').val(),
                        ID2: $('#TextBox2').val()
                    }, //Data sent to server
                    contentType: "text/html; charset=utf-8", // content type sent to server
                    dataType: "json", //Expected data format from server

                    processdata: true, //True or False
                    success: function (data, textStatus) {

                        if (data.redirect) {
                       
                            window.location.href = data.redirect;
                        }
                        else {
                   
                            $("#notification").replaceWith(data.form);
                        }
                     

                    },
                    error: ServiceFailed// When Service call fails
                });


                return false;
            });

<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {
      /* lấy connect string từ web.config, k để đường dẫn trên code */
      
        SqlConnection conn = new SqlConnection("Data Source=ASIA_ITS\\THAI;Initial Catalog=skyserver;Integrated Security=True");
    
        conn.Open();
        SqlCommand cmd = new SqlCommand();
        cmd.Connection = conn;

        cmd.CommandType = CommandType.StoredProcedure;
        cmd.CommandText = "st_login_user"; /*procedure de truyen tham do */

        SqlParameter p1 = new SqlParameter("pr_email", "abc");
        SqlParameter p2 = new SqlParameter("pr_pass", "123456");
        p1.IsNullable = true;
        p2.IsNullable = true;
        p1.Direction = ParameterDirection.Input;
        p2.Direction = ParameterDirection.Input;

        cmd.Parameters.Add(p1);
        cmd.Parameters.Add(p2);
        
        /* lấy giá trị return từ SQL */
        
        SqlParameter returnValue = new SqlParameter("return", SqlDbType.Int); /*return la thma so tra ve tu SQL */
        returnValue.Direction = ParameterDirection.ReturnValue;
        cmd.Parameters.Add(returnValue);
        cmd.ExecuteNonQuery();
        int ret = Int32.Parse(cmd.Parameters["return"].Value.ToString());

        SqlDataReader read = cmd.ExecuteReader();

        switch (ret)
        {
           

            case 0:

                Response.Write("<p>Wrong Pass!</p>");
                
                break;

         

            case 1:

                Response.Redirect("Home_user.aspx");
                          
                break;
                
        }
        read.Close();
      
    }   
         
    
   
    
</script>