Selected Index Changed fires twice?

Posted on 2006-11-06
Medium Priority
Last Modified: 2008-03-04
Is it true that Selected Index Changed event ACTUALLY fires twice, once when you leave the row you are on, and once when you "highlight" the new row (the new row receives the focus) ?
Question by:Tom Knowlton
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Accepted Solution

ZeonFlash earned 2000 total points
ID: 17882426
What control are you referring to?  

I would rather seriously doubt that it does, in any case.  The change event is a single occurrence, much like a light bulb.  When you hit the switch, the bulb CHANGES from Off to On...it doesn't register a state of "in between".  So when, for example, a combobox has a selected index change, it's a single event going from Index A to Index B.  It doesn't go from Index A to Index NULL, then again from Index NULL to Index B.

Author Comment

by:Tom Knowlton
ID: 17894090
What about ListViews?
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Expert Comment

ID: 17895392
For ListBoxes, the behavior is the same, and is extended by the SelectionMode:

One - SelectedIndexChanged is fire everytime an item is clicked.
MultiSimple - Fired everytime an item is selected OR de-selected.
MultiExtended - Fired everytime an individual item is clicked (selected or de-selected), but when holding the shift key and clicking, the event only fires once (even though multiple items may have been highlighted)

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