Find out current user's SID and replace .xml content?

Question

C++ / C#

Hello. You need to create a console application in C#.
1. Find out the user's SID, in this form S-1-5-21-2303912444-598105561-2700407050-1001
2. Replace the word "C-han-ge-me" in the desktop.xml file with the found SID.

desktop.xml file

<Principals>
    <Principal id="Author">
      <UserId>C-han-ge-me</UserId>
      <LogonType>InteractiveToken</LogonType>
      <RunLevel>LeastPrivilege</RunLevel>
    </Principal>
  </Principals>

Answer 1

Replaces the word "C-han-ge-me" with the word "strUser". but you need to replace it with a value like S-1-5-21-2303912444-598105561-2700407050-1001

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Security.Principal;
using System.Web.Security;
using System.IO;
 
namespace ConsoleApp13
{
 
    class Program
    {
        
        static void Main(string[] args)
        {
            string strUser = System.Security.Principal.WindowsIdentity.GetCurrent().User.ToString();
            File.WriteAllText("desktop.xml", File.ReadAllText("desktop.xml").Replace("C-han-ge-me", "strUser"));
        }
    }
}