Combo Properties..

Question

..does anyone know how to setup a combo in C# so that it: 1. doesnt allow you to edit the text it displays (so u can just select items), and 2. allows you to press a key and then the selection jumps to the first entry starting with that letter i.e. 'a' would mean it jumps to a selection called 'automobile' for example. Thanks 4 ure help..