C# Spara data från fil till en klass.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Guldkortet
{
    public partial class Form1 : Form
    {
        TcpClient client;
        TcpListener listener;
        int port = 12345;

        List<User> userData = new List<User>();
        //Mesage tar emot bytedata och konverteras till Unicode sträng.
        string message;
        string data;
        //Splittad sträng från NOS_export lagras vector.
        string[] vector;

        public Form1()
        {
            InitializeComponent();
            //client.NoDelay = true; 

            // User object
            StreamReaderUserData(userData);
            
            

        }


        private void BtnConnect_Click(object sender, EventArgs e)
        {
            try
            {
                listener = new TcpListener(IPAddress.Any, port);
                listener.Start();
            }
            catch (Exception error) { MessageBox.Show(error.Message, Text); return; }
            {
                BtnConnect.Enabled = false;
                StartReceiver(); // StartReceiver() HERE !!
            }
        }


        public async void StartReceiver()
        {
            try
            {
                client = await listener.AcceptTcpClientAsync();
            }
            catch (Exception error) { MessageBox.Show(error.Message, Text); return; }
            StartReader(client); // StartReader() HERE !!
        }


        public async void StartReader(TcpClient c)
        {
            byte[] buffert = new byte[1024];

            int n = 0;
            try
            {
                n = await c.GetStream().ReadAsync(buffert, 0, buffert.Length);
                message = Encoding.Unicode.GetString(buffert, 0, n);

            }
            catch (Exception error)
            {
                MessageBox.Show(error.Message, this.Text);
                return;

            }
            StartReader(c);

            data = message;
            // Splittar på datan som skickas från NOS_export. 
            SplitterCheckData(data, userData);

        }
        

        //splits message into two strings and compares the data with the strings in the list.
        public void SplitterCheckData(string data, List<User> list)
        {
            List<string[]> cData = new List<string[]>();
            vector = data.Split(new string[] { "-" }, StringSplitOptions.None);
            cData.Add(vector);

            foreach (string[] item in cData)
            {
                ReturnData.AppendText(item[0] + " SEPARATOR " + item[1] + "\r\n");
            }

        }



        // Opens a path to directed file
        public void StreamReaderUserData(List<User> list)
        {
            User newUser;
            string item = "";
            string[] vektor;
            List<string> userSaver = new List<string>();
            List<string[]> strVektor = new List<string[]>();
            
        
            StreamReader reader = new StreamReader("kundlista.txt", Encoding.Default, true);

            if (File.Exists("kundlista.txt"))
            {
                while ((item = reader.ReadLine()) != null)
                    userSaver.Add(item);

                foreach (string s in userSaver)
                {
                    vektor = s.Split(new string[] { "###" }, StringSplitOptions.None);
                    strVektor.Add(vektor);
                    newUser = new User();
                    list.Add(newUser);
                    newUser.UserNumber = vektor[0];
                    newUser.Name = vektor[1];
                    newUser.City = vektor[2];
                }
                // Strömmen strängs.
                reader.Close();
            }
        }

        public void StreamReaderCardData(List<User> list)
        {
            User newUser;
            string item = "";
            string[] vektor;
            List<string> userSaver = new List<string>();
            List<string[]> strVektor = new List<string[]>();

            StreamReader reader = new StreamReader("kortlista.txt");

        }


        private void BtnLoadList_Click(object sender, EventArgs e)
        {
            LbReturnData.Items.AddRange(userData.ToArray());
        }
    }


    public class User
    {
        public string UserNumber { get; set; }
        public string CardNumber { get; set; }
        public string Name { get; set; }
        public string City { get; set; }
        public string GoldCard { get; set; }

        public override string ToString()
        {
            return UserNumber + "-" + CardNumber + " " + Name + ". From " + City + " || "  + GoldCard;
        }
    }

    public class GoldCard
    {
        public string Health { get; set; }
        public string Power { get; set; }
        public string ElementalSkill { get; set; }
    }

    public class Dunderkatt : GoldCard
    {
        public override string ToString()
        {
            return base.ToString();
        }
    }

    public class Kristallhäst : GoldCard
    {
        public override string ToString()
        {
            return base.ToString();
        }
    }

    public class Överpanda : GoldCard
    {
        public override string ToString()
        {
            return base.ToString();
        }
    }

    public class Eldtomat : GoldCard
    {
        public override string ToString()
        {
            return base.ToString(); 
        }
    }

}