Webform: How to unselect selected listitem in listbox?

[mikev]

Hi all

I have a listbox which is 5 rows high. There are 5 list items. The
first one is selected. I wish to click on a button and have the
selection focus on the listbox removed. Removed, unselected,
nullified?!

cheers

 

[mikev]

listbox.SelectedIndex = -1;