private IEnumerable<ExchangeDataViewModel> CreateData()
        {
            ExchangeDataViewModel[] data = new ExchangeDataViewModel[]
            {
                CreateForexData("EUR/USD"),
                CreateForexData("EUR/GBP")
            };

            return data;
        }
        private ExchangeDataViewModel CreateForexData(string name)
        {
            DateTime now = DateTime.Now;

            ExchangeDataViewModel exchangeData = new ExchangeDataViewModel()
            {
                StartDate = now.Subtract(TimeSpan.FromDays(365d)),
                EndDate = now,
                Name = name
            };
            exchangeData.Data = CreateExchangeData(exchangeData.StartDate, exchangeData.EndDate);

            return exchangeData;
        }