I am using another piece of software that will be executing a C# Script.

I am using VS2022 to code that script because the other software’s IDE sucks.
All I’m trying to do is run this code (to begin with):

using System.Web.UI.HtmlControls;
using (StringWriter sw = new StringWriter())
{
  Table t = new Table();
  TableRow tr = new TableRow();
  TableCell td = new TableCell {Text = "Some text... Istanbul"};

  tr.Cells.Add(td);
  t.Rows.Add(tr);

  t.RenderControl(new HtmlTextWriter(sw));

  string html = sw.ToString();
  Console.Write(html);
}

When I execute I get “UI doesn’t exist in namespace System.Web”.

???

So now I’m trying to add a reference, but I can’t figure out how to do this.
In Reference Manager there’s nothing to chose from except COM stuff.
I browse to “C:WindowsMicrosoft.NETFramework64v4.0.30319System.Web.dll”, but when I chose it, it says “The reference is invalid or unsupported.”

What the heck am I supposed to do here?

Why is this so difficult. It didn’t used to be in earlier versions on VS.