protected override ICollection <CurrencyViewModel> LoadCollection()
 {
     _Loader = new CurrencyVMCollectionLoader();
     return(_Loader.GetAllCurrency());
 }
 protected override async Task <ICollection <CurrencyViewModel> > LoadCollectionAsync()
 {
     _Loader = new CurrencyVMCollectionLoader();
     return(await _Loader.GetAllCurrencyAsync());
 }