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private void listView1_SelectedIndexChanged(object sender, EventArgs e)
        {
            XmlDocument anzeige = new XmlDocument();
            anzeige.Load("\\\\gtfile\\Perkura\\bin\\jobs.xml");
            foreach (XmlNode liste in anzeige.SelectSingleNode("Verarbeitungen"))
            {
                //if (listView1.SelectedItems[0].Text == liste.Attributes["name"].Value)
                //{
                //    label3.Text = liste.Attributes["name"].Value;
                //}
            }
            textBox1.Text = listView1.SelectedItems[0].Text;
            
        }					

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ListView listView = sender as ListView;
if(listView.SelectedItems.Count > 0)
{
   string text = listView.SelectedItems[0].Text;
   // ...
}					

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pivate void listView1_ItemSelectionChanged(object sender, ListViewItemSelectionChangedEventArgs e)
{
  if listView1.SelectedItems.Count > 0 )
    {....
    textBox1.Text = e.Item.Text;
    //-- ist gleichbedeutend mit
    textBox1.Text = listView1.Items[e.ItemIndex].Text;
    }
}
}