title: C# database Combobox
body: <p>I have a problem and I don't know how to solve it - Well,I'd like to have an option to choose between two things in one combobox - "Sells" and "Services".Under this combobox there will be another combobox , which will be waiting to see what will the user choose between "Sells" and "Services" , if "Sells" is choosen then in the second combobox the user to have options between "authoparts","autoequipment","cars" if "Services" - "full service","replacement of consumables","purchase of vehicles".Thank you very much for the given time </p>