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listview1.Clear();

listview1.Items.Add("Test");					

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public class Form2 : Form
{

    private string vorname;
    public string Vorname { get
      {
         return vorname;
      }
    }


    public void weiterClicked(object sender, EventArgs e)
    {
        vorname = dieTextBoxMitVorname.Text;
        Close();
    }
}					

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public void zeigeFormular()
{
    Form2 f2 = new Form2();
    f2.ShowDialog();

    trageInListViewEin(f2.Vorname);
}