How to set multiple selections in ASP.NET ListBox?

asp.net, listbox

Solution

this is the VB code to do so...

myListBox.SelectionMode = Multiple
For each i as listBoxItem in myListBox.Items
  if i.Value = WantedValue Then
      i.Selected = true
  end if 
Next

Problem

I can't find a way to select multiple items in an ASP.NET ListBox in the code behind? Is this something needs to be done in Javascript?

Original source