Can't create a file outside of the appfolder

Hi there, so I need to keep a file when app is uninstalled, so as I know android OS deletes all files inside the appfolder, that's why I'm trying to keep the data some where not inside appfolder, when I try to create a file outside of that folder Java.IO.IOException: Permission denied.
var dbFile = new File("/data/user/", "silkdatabase.db"); //
var created = dbFile.CreateNewFile();