User

 public class User
    {
        public User(string username, string password, int facNumber, int role, DateTime validUntil)
        {
            Username = username;
            Password = password;
            FacNumber = facNumber;
            Role = role;
            ValidUntil = validUntil;
        }

        public string Username { get; set; }
        public string Password { get; set; }
        public int FacNumber { get; set; }
        public int Role { get; set; }
        public DateTime ValidUntil { get; set; }
        public override string ToString()
        {
            return $"{this.Username} has a password: {this.Password}. The person has fac number: {this.FacNumber}. Their role is {this.Role}.Is valid until {this.ValidUntil.Year}th year.";
        }
    }