As you well guessed the suitable event for your scenario would be the OnClientEntryRemoving
. You could loop through the Entries collection of the AutoCompleteBox and get the position of the Entry which is about to be removed.
As for your other questions - yes, it is possible. For example, you could store the Entity type in the id value of the entries. I had prepared a sample page for you, demonstrating both implementations. Find it attached and let me know if you have any questions. In addition, here is a video
, demonstrating the behavior at my end.
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