private void ListBox1_SelectedValueChanged(object sender, EventArgs e)
{
if (ListBox1.SelectedIndex != -1)
{
textBox1.Text = ListBox1.SelectedValue.ToString();
// If we also wanted to get the displayed text we could use
// the SelectedItem item property:
// string s = ((USState)ListBox1.SelectedItem).LongName;
}
}