Cant get Innertexts from webpage using html agility pack xpath in c#

Question

So this is my code guys. Im trying to get the text inside a span and storage it locally. Im using html agility pack and trying to retrieve the text using xpath but the nodes dont retrieve anything and appear as null.

This is the page im trying to get the text from: https://siat.sat.gob.mx/app/qr/faces/pages/mobile/validadorqr.jsf?D1=10&D2=1&D3=15030267855_SDS150309FC7 Specifically the "Denominación o razón social" text.

namespace ObtencionDatosSatBeta
{
    public partial class Form1 : Form
    {
        DataTable table;
        public Form1()
        {
            InitializeComponent();
            
        }
        private void InitTable()
        {
            table = new DataTable("tabladedatosTable");
            table.Columns.Add("Variable", typeof(string));
            table.Columns.Add("Contenido", typeof(string));
            //table.Rows.Add("Super Mario 64", "84%");
            tabladedatos.DataSource = table;
        }

        private async void Form1_Load(object sender, EventArgs e)
        {
            InitTable();
            HtmlWeb web = new HtmlWeb();
            var doc = await Task.Factory.StartNew(() => web.Load("https://siat.sat.gob.mx/app/qr/faces/pages/mobile/validadorqr.jsf?D1=10&D2=1&D3=15030267855_SDS150309FC7"));
            var nodes = doc.DocumentNode.SelectNodes("//*[@id=\"ubicacionForm: j_idt12:0:j_idt13: j_idt17_data\"]//tr//td//span");
            var innerTexts = nodes.Select(node => node.InnerText);
            
        }

        private void tabladedatos_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }
    }
}

Any idea?

var nodes = doc.DocumentNode.SelectNodes("//*[@id=\"ubicacionForm: j_idt12:0:j_idt13: j_idt17_data\"]//tr//td//span");

The line of code above is the one that appears as null.

Answer 1

Use this Xpath which gets the first span under the element with the following ID: ubicacionForm:j_idt10:0:j_idt11:j_idt14_data

(//*[@id='ubicacionForm:j_idt10:0:j_idt11:j_idt14_data']//span)[1]

You can select the element using multiple different ways by copying the HTML in chrome (Ctrl + Option + J)

And then paste the HTML in Xpather where you can play around with your Xpath. Xpather.com