c# - How to reference/link to a listbox that is dynamically created using a button and tabControl? -

i working on making music player in c#. making music playlists right , stuck. of right using tabcontrol , button adds tab empty listbox in it. here code button:

private void button10_click(object sender, eventargs e) {     tabpage tp = new tabpage("playlist");     tabcontrol1.tabpages.add(tp);      listbox lb = new listbox();     lb.dock = dockstyle.fill;      tp.controls.add(lb); } 

the problem running not know how allow user add music these dynamically created listboxes within tabs. main list of music located in listbox in first tab , want user able select music , put in new listboxes or "playlists" need reference them somehow.

i'll assume have button (addtoplaylistbutton), textbox (playlistname) add selected song entered playlist (tab-) name , songs listbox called songlist. i'll furthermore assume every new playlist has new tab. in case you'll have identify them i'd change name of tabs:

tabpage tp = new tabpage($"playlist {tabcontrol1.tabpages.count}"); 

so you'll have handle button click event addtoplaylistbutton that:

private void onaddtoplaylistbutton_click (object sender, eventargs e) =>     (tabcontrol1.tabpages.cast<tabpage>()         .firstordefault(page => page.text == playlistname.text)         ?.controls.cast<control>()         .firstordefault(control => control listbox) listbox)?.items.add(songlist.selecteditem);