How to count the number of trading days between two dates?

I am trying to calculate the number of trading days between two dates.


I am trying to use

DateTime end = new DateTime(2018, 4, 18);

var monthTradingdays = TradingCalendar.GetDaysByType(TradingDayType.BusinessDay, Time, end).ToArray();

but then I do not know how to proceed from this point...


Just need the trading calendar for regular US stocks like SPY.


Thanks a lot!

Update Backtest

update, a simple code works...:


Update Backtest


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