I am trying to make a card game, and I made my own shuffle function in rTools, but every time I update the console (e.g. using a console.readline statement) it re-randomizes the list. For example, in a list<string> of 1,2,3,4,5 and I use rTools.shuffle on it, the first three would be something like 3, 5, and 2. But after I refresh it without restarting the code, it would be a completely different series. I'm using an online editor, dotnetfiddle.net, if that changes anything. I have tried multiple different approaches- here is my code:

using System;
using System.Collections.Generic;

namespace elementCard
{
    public class rTools {
        public rTools() {
            dddd = DateTime.Now;
            llll = dddd.Ticks;
            ssss = llll.ToString().Substring(llll.ToString().Length - 8, 8);//This is because the original long was not accepted by System.Random(int)
            _seed = Int32.Parse(ssss);
        }
        private DateTime dddd
        { get; set; }
        private long llll
        { get; set; }
        private string ssss
        { get; set; }
        private int _seed
        { get; set; }
        public List<string> shuffle(List<string> l) 
            {
                int count = l.Count-1;
                List<string> ret = new List<string>();
                int ind = 0;
                Random rng = new Random(_seed);
                string card = null;
                while (count > -1) 
                {
                    ind = rng.Next(0, count);
                    card = l[ind];
                    l.RemoveAt(ind);
                    ret.Add(card);
                    card = null;
                    count--;
                }
                return ret;
            }
    }
    public class Program
    {
        public static void Main()
        {
            rTools rtools = new rTools();
            Console.WriteLine("Hello World");
            List<List<string>> playerHands = new List<List<string>>();
            //