C# applikation med tekstfil som DB

CSharp kode 

 public class User
         {
             public int ID { get; set; }
             public string Firstname { get; set; }
             public string Lastname { get; set; }
         }
         static void Main(string[] args)
         {
             var users = ReadUsers();
 
             Console.WriteLine("DONE");
         }
 
         public static List<User> ReadUsers()
         {
             using (var reader = new StreamReader(new FileStream(Path.Combine(Directory.GetCurrentDirectory(), "users.txt"), FileMode.Open)))
             {
                 var users = new List<User>();
                 while (!reader.EndOfStream)
                 {
                     var userInfo = reader.ReadLine().Split('\t');
 
                     var userId = 0;
 
                     Int32.TryParse(userInfo[0], out userId);
 
                     users.Add(new User() { ID = userId, Firstname = userInfo[1], Lastname = userInfo[2] });
                 }
 
                 return users;
             }
         }

CSharp kode 

 static void ListEmployee()
 {
     Console.Clear();
     string line; //string that will contain the current line when reading the txt-file
     StreamReader file = new StreamReader(@"C:\Badehotel\users.txt");
     Console.WriteLine("-------------------------------");
     Console.WriteLine("Username   | Password");
     Console.WriteLine("-------------------------------");
     while ((line = file.ReadLine()) != null)
     {
         if (line.Contains("employee"))
         {
             string[] employee = line.Split(',');
                     
             Console.WriteLine(String.Format("{0,-10} | {1,-10}", employee[0], employee[1]));
                     
         }
     }
     Console.WriteLine("-------------------------------");
     file.Close();
     Console.WriteLine("Press any key to return to menu...");
     Console.ReadKey(true);
     //End of the code that pauses the application until the user inputs a key
     Console.Clear();
     AdminMenu();
 }