Thank you very much for the response. I am sorry for not making my question clear. Here is what I would like to implement Autocomplete/Autosuggest feature when user perform the location search. I was able to use QueryAsync to get the list of addresses or streetname from the feature in geodatabase then bind to ComboBox that has Autocomplete feature. I found this way had an issue because of the hit with memory increasing in the way up to 400MB. Is there a better way to implement it?