public double GetCash(DateTime date) { return(CashTransactions.Where(x => x.Key <= date).Select(x => x.Value).Sum()); }
internal static decimal GetTicketTotalAmount() { return (CashTransactions.Where(x => x.PaymentType == (int)PaymentType.Ticket && x.TransactionType == (int)TransactionType.Income).Sum(x => x.Amount) - CashTransactions.Where(x => x.PaymentType == (int)PaymentType.Ticket && x.TransactionType == (int)TransactionType.Expense).Sum(x => x.Amount)); }