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Changed browser from Google chrome to firefox it all works now


The problem is that a listbox can't store a null, what I have done previously in a combobox situation is put "" in the list as a marker, keep a list of the real values (null being 0 in the list) and then use the selected index property to lookup the list against the real value. Of course you don't really need the list, but in this case it was select one ...


This type of project is com project. In default setting Common Language Runtime (COM) project will not throw exception. You have to activate it in Debug->Exception (Ctrl+Alt+E) dialog box to break on break points.

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