Make ListBox items have a different value than item text

Question

I want a ListBox full of items. Although, each item should have a different value. So when the user selects an item and presses a button, a method will be calle

Answer 1

Very simple:

foreach(var item in *Your Source List*)
        {
            ListItem dataItem =  new ListItem();
            dataItem.Text = "value to show";
            dataItem.Value = *another value you want*;
            listBox.Items.Add(dataItem);
        }