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reproducible combo box bug

guy
create a winforms app with 1 form with a combo box on it,
add some items to the items collection.

In the ComboBox1_SelectedIndexChanged event handler
display a msgbox, optionally set a breakpoint on it

run the app
hold the mouse button down onthe combo box dropdown
button -
DO NOT release it
drag the mouse over the dropped down items and off the
combo box area onto the form
release the mouse button

the ComboBox1_SelectedIndexChanged will fire !
even though the selected index has not changed - it is
still -1

in our app we were getting lots of problems (null
reference exceptions etc as selected item was null) until
we found the cause

hth guy
Jul 19 '05 #1
0 1282

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