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In SfComboBox, SelectedIndexChanged event fires for every key when set the AutoComplete mode to SuggestAppend. When key press on combobox with SuggestAppend mode, the item will be selected based on the current text which pressed on combobox. The SelectedIndexChanged event will be called even the item is already selected.

Replication procedure:

1. Run the sample.

2. Clear the text in ComboBox

3. Press the key "A"

4. Now you can able to see the "Alaska" item text is append and also this is selected in drop down.

5. Now press "l" key, same item only selected in drop down, but the SelectedIndexChanged event is fired.

Expected result:

We need to restrict to fire the SelectedIndexChanged on key press, if the item is already is selected.