friendly urls causes double page enter

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C#

ASP.NET

I'm trying to make a friendly url following the instructions on this page[^].
in order to change `www.samplepage.com/Default.aspx?Category=Desserts&Page=4` into `www.samplepage.com/Default.aspx/Desserts/Page4`. It works however, every time I enter the friendly URL, it enters the page twice. I couldn't say it is a postback, since it enters on the validation `if(!IsPostBack)` and it happens on each page i tried, complex pages and text only pages.

How can I prevent this double page entry?

ASPX code

    <%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="ResultPool.aspx.cs" Inherits="Drawit.ResultPool" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
    <link href="Content/Site.css" rel="stylesheet" />
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="FeaturedContent" runat="server">
</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="MainContent" runat="server">
    <ul>
        <li class="labelForm"><asp:Label ID="lblResult" runat="server" Text=""></asp:Label></li>
        <li class="labelForm"><asp:Label ID="lblOriginal" runat="server" Text=""></asp:Label></li>

        <li class="labelForm"><asp:Button ID="btnHome" runat="server" Text="Button" OnClick="btnHome_Click" /></li>
    </ul>
</asp:Content>

.CS code

public partial class ResultPool : System.Web.UI.Page
{


    protected void Page_Load(object sender, EventArgs e)
    {
        string Mensaje = "El proceso de ";
        string RutaArchivo = "~/Images/Results/";
        if (!IsPostBack)
        {
            try
            {
                string stats;
                if (Request.PathInfo.Length > 0)
                    stats = Request.PathInfo.Substring(1);
                else
                    stats = "Error";

                string[] result = stats.Split('/');
                stats = result[0];

                switch (stats)
                {
                    case "OK":
                        {
                            Mensaje += result[1] + " ha finalizado con exito!";
                            break;
                        }
                    case "NO":
                        {
                            Mensaje += result[1] + " ha tenido un error y no pudo finalizar!";
                            break;
                        }
                    case "Error":
                        {
                            Mensaje = "Ha ocurrido un error. Por favor intente mas tarde.";
                            break;
                        }
                    default:
                        {
                            Mensaje = "Ha ocurrido un error. Por favor intente mas tarde.";
                            break;
                        }
                }
                lblResult.Text = Mensaje;
            }
            catch (Exception)
            {
                lblResult.Text = "There was an error!";
            }

        }
    }