Sort a listbox with reverse alphabetical order?

[kenne76]

How do I sort a listbox as reverse alphabetical order with this code?

listBoxComputer.DataSource = Directory.GetDirectories(rootDir).Select(Path.GetFileName).ToList(); 
listBoxComputer.SelectedIndexChanged += listBoxComputer_SelectedIndexChanged;

[Arjay]

listBoxComputer.DataSource = Directory.GetDirectories(rootDir).Select(Path.GetFileName).OrderByDescending(i => i).ToList();