Hello there..
Look this http://csharpdotnetfreak.blogspot.com/2009/01/winforms-autocomplete-textbox-using-c.html
i have applied this for City Field textbox that displays the CityNames on Typing as Suggestion
I have taken a DataTable as DataSource which was pre-filled from Database.
I loop through DataTable and Add a CityNames to the AutoCompleteStringCollection
Now Problem is that How do i get Values that is(CityId) when Save My Record to the Database.