Moving Information From ListBox to Another ListBox that are bound to datatables
<p>I have two ListBoxes bound to DataTables. When I try to move information from one ListBox to another listbox using a button click with the following code:</p>

<pre><code>protected void btnAdd_Click(object sender, EventArgs e){
    ListBox1.Items.Add(ListBox2.SelectedItem);
    ListBox2.Items.Remove(ListBox2.SelectedItem);
}
</code></pre>

<p>One items is removed from ListBox2 and added to ListBox1 but if I try and click the button again with a newly selected item nothing happens.</p>

<p>I'd like to be able to move up to all the items from listbox 1 into listbox 2. </p>
