.net - Uninstalling Windows Mobile application doesn't remove file in IsolatedStorageFile -

i have windows phone 8 application. installed application in device running windows 10 mobile. after uninstalling application device found sqlite db file exists in isolatedstoragefile

isolatedstoragefile store = isolatedstoragefile.getuserstoreforapplication(); store.fileexists(dbname)  // returns true 

i added file storage through method:

assembly assem = assembly.getexecutingassembly(); copyfromcontenttostorage(assem.fullname.substring(0, assem.fullname.indexof(',')), dbname);      private void copyfromcontenttostorage(string assemblyname, string dbname)     {         isolatedstoragefile store =             isolatedstoragefile.getuserstoreforapplication();         system.io.stream src =             application.getresourcestream(                 new uri("/" + assemblyname + ";component/" + dbname,                         urikind.relative)).stream;         isolatedstoragefilestream dest =             new isolatedstoragefilestream(dbname,                 system.io.filemode.openorcreate,                 system.io.fileaccess.write, store);         src.position = 0;         copystream(src, dest);         dest.flush();         dest.close();         src.close();         dest.dispose();     } 

i tested app on 2 devices running windows phone 8 * 8.1 . works correctly on devices;

is bug in windows mobile 10 or must change code?