Listbox item removed but item List text stays visible

A listbox contains 5 items. The text of each item is "1", "2", "3", "4", and "5" Also each entry has it's ItemData with the same values; ie, 1 ,2, 3, 4, 5. So, the listbox looks like this:

Now I remove item 2 or the entry that says "3". Now the listbox now looks like this:

OK, so far.

Now I add that removed item back again. So now the listbox looks like this:

OK, so far

Now I start removing each entry from the listbox using this code:

The loop is executed each time the variable NumberToRemove changes.

The 1st time, NumberToRemove, contains the value 1

So, item 0 was removed from the listbox. Now the listbox looks like this:

Now NumberToRemove contains the value 2 and the listbox looks like this:

Now NumberToRemove contains the value 4 and the listbox looks like this:

Next NumberToRemove contains the value 5 and the listbox looks like this:

And last, NumberToRemove contains the value 3 and the listbox looks like this:


When I single step through the loop on this last time I see that

List1.RemoveItem n is executed and n = 0 but the item text, "3" remains visible in the listbox although the listbox's ListCount is 0