Question

I wrote a code that whenever the user picks a value from the drop-down comboBox, their choice becomes the first item (index 0) of the collection.

Example

BEFORE

[_ MyComboBox _][v]

     |Dog
     |Tree
     |House

USER CLICKS “Tree”

AFTER

[_ MyComboBox _][v]

     |Tree
     |Dog
     |House

The problem is that after this operation, even though everything works fine, the comboBox remains blank and the user has no clue about what they’ve done.

But if I do as everyone suggests, that is MyComboBox.SelectedIndex = 0; it triggers an inifinite loop since I’d be calling it from inside the event handler MyComboBox_SelectedIndexChanged(…)

I also tried MyComboBox.Text = string_that_contains_what_I_want_to_display; but it triggers BOTH SelectedIndexChanged AND SelectedValueChanged.

Frankly I cannot understand why even switching from items with the same value, BOTH index and value are triggered. As far as I understand, SelectedValueChanged should only be triggered when the two items have different content.

I’d be thankful to anyone that will help me get out of this puzzle.

I just need to show the result of the sort operation in the program interface, after it’s done. I could reload the whole page containing my control: it would work, but that wouldn’t be very efficient.

Answer 1

Use the SelectionChangeCommitted event instead of SelectionChange. The SelectionChangeCommitted event is only fired when the user makes a change rather than when your program makes the change for it.