private void CreatePreviosRate(Rate currentRate, double buy, double sell)
 {
     _localSettings.CreateSetting(currentRate.Name, EnumHandler.GetDescriptionFromEnumValue(RateOptions.Buy), buy.ToString());
     _localSettings.CreateSetting(currentRate.Name, EnumHandler.GetDescriptionFromEnumValue(RateOptions.Sell), sell.ToString());
     _localSettings.CreateSetting(currentRate.Name, "date", LastUpdate.ToString());//.ToString("dd MM yyyy")
 }