Change the auto-complete behaviour of a textbox

Change the auto-complete behaviour of a textbox

I have two doubts about the autocomplete feature of textboxes in C#.
First, I want to display the full list, not only the ones that start with
the given text, and secondly I want to prevent the auto-complete of
specific options (some are category titles).
I've been checking the textbox properties and there's nothing related to
it, so probably the main question could be, Is there a way to modify /
override the textbox events in order to handle the auto-complete actions?
(I don't know if it applies to show the full list too)