Pasting

namespace WindowsFormsApp16
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnKnap_Click(object sender, EventArgs e)
        {
            int alder = int.Parse(txtInputAlder.Text);
            lblSvarUd.Text = "Du er " + alder + "år gammel";
        }
    }
}