I have two listboxes on an asp.net page. The first one is a multiselect that allows the user to select specific employees. They can then move their selected employees (via a button click) to the other listbox. Pretty standard fare and that all works fine. Before they click continue, I want to make sure there are employees in the second listbox and it is not empty. How would I validate that? Can I use a required field validator somehow or would I need a custom validator? Please be specific.
Thanks in advance