vb.net - Populate Listbox with directory contents but only accept certain extensions -

so, drag in folder onto form, , listbox populates paths of files inside. i've managed make listbox accept .mp3 paths, how can add more accepted extensions?

 private sub form1_dragdrop(sender system.object, e system.windows.forms.drageventargs) handles me.dragdrop             dim files() string = e.data.getdata(dataformats.filedrop)             each path in files             if directory.exists(path)                     'add contents of folder listbox1                     listbox1.items.addrange(io.directory.getfiles(path, "*.mp3*")) 

as can see in last line above, paths in folder having .mp3 extension accepted. how add more accepted extensions, .avi, .mp4 etc?

i've tried listbox1.items.addrange(io.directory.getfiles(path, "*.mp3*" + "*.mp4*"))

i've tried listbox1.items.addrange(io.directory.getfiles(path, "*.mp3*" , "*.mp4*"))

no luck !

you should create loop, test extension, , add or not...

something like;

    dim allowedextension string = "mp3 mp4"     each file string in io.directory.getfiles("c:\", "*.*")         if allowedextension.contains(io.path.getextension(file).tolower)             listbox1.items.add(file)         end if     next 

or more dirty;

io.directory.getfiles(path, "*.mp*") 

or twice;

add

     listbox1.items.addrange(io.directory.getfiles(path, "*.mp3*")) 

and

     listbox1.items.addrange(io.directory.getfiles(path, "*.mp4*"))