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What is the best way to validate a selected value in a ComboBox?

Posted on 2013-12-04
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Last Modified: 2013-12-05
What is the best or preferred method to validate a value selected from a ComboBox. What are the best Events to use?

Thanks!
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Question by:BlakeMcKenna
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Jacques Bourgeois (James Burger) earned 350 total points
ID: 39697241
Depends on what you intend to validate and how. Otherwise, you would not have all the choices that are offered.

SelectedIndexChanged is very often the best choice because it is triggered for every change of selection.

SelectedValueChanged might be better in some circumstances, specially if you have many entries in the list that ends up returning the same value. In such a case, moving between 2 such entries would not trigger the event.

And although I find it more useful in other controls such as a TextBox, Validating could also be considered because its e.Cancel parameter makes it easy to keep the cursor in the ComboBox without triggering a few other events when the validation falls flat.
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by:BlakeMcKenna
ID: 39698227
So whatever Event uses the e validating argument, setting "e.Cancel = True" will keep the cursor in that control? Don't know why I never bothered to look that one up!

Thanks James
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