It seems to me like there should be a method that would select or deselect all items in a listbox, but there is not. Here is a simple sub to accomplish this task:
Public Sub SelectAllListBoxItems(ByVal lv As ListBox, ByVal selected As Boolean)
For i As Integer = 0 To lv.Items.Count - 1
ListBoxValidations.SetSelected(i, selected)
Next
End Sub
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