move items from one listbox to another listbox

Question

I need to move items from one listbox to another listbox on button click event in silverlight Application.

I use the follow code,

private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            ListBox2.Items.Add(ListBox1.SelectedItem);

            if (ListBox2.SelectedIndex != -1)
            {
                ListBox1.Items.Add(ListBox2.SelectedValue);
                ListBox2.Items.Remove(ListBox2.SelectedValue);
            }

        }

But If I try to use that above code it give the following Error,

operation not supported on read-only collection

How can solve this problem ??

Answer 1

You should use data binding to bind ObservableCollections of items to the ListBox.ItemsSource properties of your two ListBoxes:

<ListBox ItemsSource="{Binding Your1stCollectionProperty}" ... />

<ListBox ItemsSource="{Binding Your2ndCollectionProperty}" ... />

Then to move items, you just adjust the actual collections rather than try to adjust the ListBoxItems:

var itemToMove = Your1stCollectionProperty.ElementAt(indexOfItemToRemove);
Your1stCollectionProperty.Remove(itemToMove);
Your2ndCollectionProperty.Add(itemToMove);