List all Files in C drive? (including Files in subfolders?

[reconrey]

i have this right now:

 ListBox1.Items.Clear()
        Dim di As New IO.DirectoryInfo(TextBox1.Text)
        Dim aryFi As IO.FileInfo() = di.GetFiles("*.*")
        Dim fi As IO.FileInfo
        For Each fi In aryFi
            ListBox1.Items.Add(fi)
        Next

and that displays only the file name, like text.txt but i want it to display C:/Text.txt and all the files in the subfolders too, like C:/Program Files/Test2.txt but i just get test.txt from only the c:/ drive. Help.