It appears that the OP is only interested in retrieving the *Values* of ListBox items rather than a Databinding example.
The Winforms ListBox does not expose any properties that would allow you to access the Values of Selected Items, mainly because it simply databinds to Objects and calls their ToString() method to display text. Rather than trying to query the ListBox for selected values, you should instead find out the selected items and then query the actual IEnumerable datasource to find the property that matches the ValueMember. IOW, find the Values in your datasource.
