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));
}
