Simpelt bankprogram

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

namespace WindowsFormsApp38
{
    public partial class Form1 : Form
    {
        bankkunde bankunde1;
        public Form1()
        {
            InitializeComponent();
        }

        private void btnOpret_Click(object sender, EventArgs e)
        {
            bankunde1 = new bankkunde("Frank", 1000f);
        }

        private void btnTilskrivRente_Click(object sender, EventArgs e)
        {
            bankunde1.TilskrivRente(8f);
        }

        private void btnSaldo_Click(object sender, EventArgs e)
        {
            lblSaldo.Text = bankunde1.saldo.ToString();
        }

        public class bankkunde
        {
            public string navn;
            public float saldo;

            public bankkunde(string _navn, float _saldo)
            {
                navn = _navn;
                saldo = _saldo;
            }

            public void TilskrivRente(float rentesats)
            {
                saldo = saldo * (1 + (rentesats / 100));
            }
        }
    }
}