Mit første form program

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 Min_første_form_app
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnIndsætTekst_Click(object sender, EventArgs e)
        {
            txtOutput.Text = txtOutput.Text + " " + txtInput.Text;
            txtInput.Text = "";
            lblOutput.Text = lblOutput.Text + "X";

        }

        private void btnSlet_Click(object sender, EventArgs e)
        {
            txtOutput.Text = "";
        }
    }
}