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Generating static HTML on build time in ASP.NET Core 6

I have a bit of data stored in a file that I would like to display on a Razor Page in my project. The obvious thing to do would be to just read the file in the .cshtml.cs file, pass it in the model, and display it. That, or caching.
The file, however, won't change often (if at all), and any time it would change, would be accompanied by the code of the app itself changing, so a build would be necessary one way or another.
That's how I got the idea of somehow generating the desired HTML on build time.
I know that, on build time, .cshtml files are compiled into regular C#, and I was looking for a way to, perhaps, hook into this process somehow. Alas, without much success.
My other attempt was a .razor file, rendered in a Static way, with data fetched in ObInitializedAsync() which was supposed to run only once per component. However, I think that hosting this component in a Razor page interfered with it somehow, and the code was running on every page load. That, or I misunderstood the lifecycle in the first place.
I even went as far as making a .cs-only component and manually using the RenderTreeBuilder from an overridden BuildRenderTree, but it also seems to render per page load.
Lastly, I briefly considered using a source generator to create a partial, but alas, source generators can't read files, so that attempt also failed.
I'm, quite frankly, out of ideas at this point. Hence the question, perhaps someone else had the same issue, or knows something I don't.

Issues with code behind generation

For some odd reason, I can't get my page's code behind to generate, the file has been created but none of the controls seem to be getting generated in..
There are no warnings/errors coming from VS when I am trying to generate this file, this has worked in the past but suddenly it stopped working and as far as I know nothing has changed apart from I have installed .NET Demon which I have tried disabling fully but this doesn't appear to change it.
I have spent a good few hours looking into this issue and all I have found in terms of solutions is to delete the .designer.cs file and then converting the .aspx file to a web application but this does not fix my issue. I have also tried to recreate the page but no luck either, I will put below a few bits of code that may help.
Generated file namespace:
namespace Web.admin.reports {
<%# Page Language="C#" Inherits="Web.admin.reports.productpromotionsummary" Title="Promotions Summary" CodeBehind="~/admin/reports/productpromotionsummary.aspx.cs" AutoEventWireup="True" %
If you need anymore information please feel free to ask

C# Taking the html code of introduction site rather than the actual one, how to skip this?

I have the following problem. My C# application makes use of a webrequest and reades the html code of a url in order to do a bunch of things later on. While everything works fine, there are some websites that when visited they redirect you to another website (http://something.com/disclamer) for example and after you click yes you go back to the original website.
When I run my app it always only checks the html code of the disclaimer page and never gets to the actual page I asked for. I cannot really find a solution at this point since I can't find anything useful in the short html code of the disclaimer site (that comes before the one I want to check).
Any ideas on how I can skip that and take the code for the website I am actually interested in? Please note that I can't find any html redirection code indication (META HTTP-EQUIV etc) in any of the two websites.
Thank you

You can check the StatusCode to decide if you have been redirected. Status codes of 30x will tell you that you've been redirected, in which case you'll need to follow the link in the redirect.
http://msdn.microsoft.com/en-GB/library/system.net.httpwebresponse.statuscode.aspx

I believe you have to analyse the HTML code of such a page with a disclaimer to know which method is used there to make a redirect. Each case can be different: it can be either client-side or server-side redirection. If this disclaimer button submits a form, you will need to make a POST request imitating a button click.

Translating website to Arabic dynamically in C#

I am facing a pesky problem at the moment on a large website with multiple languages. On arrival at the website, it detects what country you are from and prompts you to confirm this. On confirmation, it swaps out the pages languages from the DB and displays the relevant language. This is done using jQuery. Now the problem is that Arabic reads rtl, so I need to either:
-- swap out the stylesheets for "rtl" version
or
-- change the HTML tag and include a "dir='rtl'" arrtribute
Now, I have tried both of these, with failures on both. When I view the page source, it still shows the old Css file or HTML tag without the "dir" attribute. Correct me if I'm wrong but I believe this to be due to the DOM not registering the new changes, as they have happened asynchronously via jQuery after the DOM has been instantiated.
After all that blah blah and tldr;
Is there not an easier way to swap out the text direction dynamically? If this is a DOM issue, how can I reload the DOM after the asynchronous callback?
I have been at this issue for hours now and have had very little luck on the interwebz.
Any and all help is welcome and greatly appreciated.
Kind Regards,
William Francis
EDIT:
After much investigation I found that the only way to truly work the Arabic way is with a post-back. Once the language has been selected you do a postback, then its just a simple process of changing the Stylesheet HREF attribute from code behind. There doesn't seem to be any form of JavaScript or jQuery that can change it without a post-back and still reflect the new Stylesheet. NOTE: you need to set the Stylesheet HREF on each post-back, i.e. through a master page. The Stylsheet changes do not persist across pages.
Here's a website that helped greatly and explains a whole lot on Stylesheet changes using JavaScript. sadly, it didn't work for me.
http://www.alistapart.com/articles/alternate/

There could be several things going on. I found this page to be very helpful when I was dealing with a similar thing, so I highly recommend it:
http://www.w3.org/International/tutorials/bidi-xhtml/
Also, if you aren't already doing so, use a tool like Firebug to examine the generated DOM after your AJAX has run to be sure you are seeing the altered state of the DOM and not the initial source of the page. It is possible to change the dir dynamically--you can use Firebug to add a new attribute to the HTML tag of this very page (set dir="rtl") to see it change dynamically. It could be some other element is overriding the direction, it could be that the AJAX changes aren't loading correctly, or other things. If you can post more of your code it would be helpful to give a better answer, but I hope this will help.

ASP.NET C# Properly Generating HTML for Page

I realize this is probably a fundamental thing I should know but I am self-teaching myself C# and asp.net so I am a little lost at this point.
I right now have 2 pages. One is an .aspx (with aspx.cs file included) that is blank and html is generated for it from a Page_Load function in the cs file. The HTML is very simple and it is just an image and some text.
The second file is a shtml file which has lots of things, serverside includes, editable and noneditable areas. I want to put my webapp into this file. My asp.net app uses Response.Write to just write out the html. This does not flow well with this page as all that does is write it at the top of the page which is because it is ran first and generates it at the top.
How can I make it to where I can generate HTML code inside the page, like within a specific DIV so it does not mess up the page. Where would a starting point be in learning how to do that.
I should note that I do not need any interaction from the user. All of this should generate right away.

I think you need to read up on some basic ASP.Net documentation and tutorials. Response.Write is not the correct approach - you need to understand how the ASP.Net page lifecycle works and how WebControls are used to render the html.
ASP.Net tries to abstract away having to create your html manually for the most part.

So if i have understood the questions correctly.
You already have an existing page/application (the shtml file) that you want to extend with some new ASP.NET components by including output from the ASP.NET page in the existing page?
This is as not something that is out of the box "supported" by ASP.NET and you "won't" be able to execute the aspx page using SSI. But you can do the opposite, an ASP.NET page does support SSI. So if you are not using any other scripts in the shtml file this might be a solution.
Otherwise the only common solutions would be either to use an AJAX framework and let it call the ASP.NET from within the existing pages or to use an iframe solution. In both cases the client will be resposible for making the calls to the ASP.NET pages and merging the results.
And then you have a issue with controlling the output from the ASP.NET page?
The Polymorphic Podcast has a good article on Controlling HTML in ASP.NET WebForms .

You can add a Literal control to the page inside the div:
<div>
<asp:Literal ID="litMarkup" runat=server />
</div>
then in your code-behind:
litMarkup.Text = "<strong>Your markup</strong>";

I don't know how well this would work for you, but could you try using an iframe to house the ASP.NET page? This should keep it in the specified region and not overwriting your shtml file. It may be something to think about.

If it is necessary that you generate your HTML output from C# code, and you would use this in more than one place, I think you may be thinking of something like what are called ASP.NET Custom Controls (not to be confused with "User Controls"-- though you probably could put together a solution with those as well, using a Literal control as another person suggested). The MSDN documentation would be a good starting point. In general, though, the writing-out-HTML-yourself-from-code model (like you would with, say, CGI applications), is not the usual ASP.NET model of development, as it largely defeats the point of using ASP.NET at all. You'd mostly want to do this sort of thing if you are writing your own web control, though this might be exactly what you are doing (hard to tell from the description).