how i transform winforms listview controlling virtualmode=true?

i have an app infinite listview terribly delayed i'm implementing virtualmode. msdn does seem cover i supplement mislay new equipment center listview.

for example, listview 1000 equipment (representing files disk) after initial race listview (by retrievevirtualitem event) files deleted total virtuallistsize competence even same after update.

question 1) i contend listview 'these equipment have changed/deleted' requeries?

additionally, files only change i'd simulate altered station listview.

question 2) i an vigilant listview given virtualmode does let me opening equipment collection i controlling before (i used containskey slight collection).

sounds easy, nonetheless i can't myself. assistance severely appreciated.

ryan