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private void listView1_MouseDoubleClick(object sender, MouseEventArgs e)
{
Point location = MousePosition;
ListViewItem item = listView1.GetItemAt(listView1 .PointToClient (location ).X ,listView1 .PointToClient (location ).Y );
if (item != null)
this.Text = item.Text;
}
ListView lv = new ListView();
object obj = lv.SelectedItems[0].Tag;