String variabel

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 Formmedstring
{
    public partial class Form1 : Form
    {
        string minFørsteString;
        public Form1()
        {
            InitializeComponent();
        }

        private void btnKnap_Click(object sender, EventArgs e)
        {
            minFørsteString = txtBoks1.Text;
            txtBoks2.Text = "Du har skrevet " + minFørsteString;
        }
    }
}