title: Delete selected items from listbox
body: <p>I want to do that but, the listbox changes on every deletion, so it throws runtime exception even if I tried to do a new object.</p>
  
  <p>I tried like this:</p>
  
  <pre><code>ListBox.SelectedObjectCollection selectedItems = new ListBox.SelectedObjectCollection(lstClientes);
     selectedItems = lstClientes.SelectedItems;
  if (lstClientes.SelectedIndex != -1)
  { 
      foreach (string s in selectedItems)
          lstClientes.Items.Remove(s);
  }
  else
      MessageBox.Show("Debe seleccionar un email");
  </code></pre>