public async Task LoadExchangeRateCZAsyncTestAsync()
        {
            try
            {
                int count = 33;

                List <ExchangeRateModel> exchangeRateModelList = await ExchangeRateService.LoadExchangeRateCZAsync();

                Assert.IsNotNull(exchangeRateModelList);
                Assert.AreEqual(exchangeRateModelList.Count, count);
            }
            catch
            {
                Assert.Fail();
            }
        }
        public async Task <IActionResult> Cz()
        {
            List <ExchangeRateModel> exchangeRateModelList = await ExchangeRateService.LoadExchangeRateCZAsync();

            return(View("Index", exchangeRateModelList));
        }