public double GetCurrentBalance()
        {
            double income  = new IncomeModel().GetTotalIncomeByAccount(null);
            double expense = new ExpenseModel().GetTotalExpenseByAccount(null);

            return(income - expense);
        }
        public double GetRemainingBalanceByMonthYear(int month = 0, int year = 0)
        {
            month = (month == 0 ? DateTime.Now.Month : month);
            year  = (year == 0 ? DateTime.Now.Year : year);

            double income  = new IncomeModel().GetTotalIncomeByMonth(month, year);
            double expense = new ExpenseModel().GetTotalExpenseByMonth(month, year);

            return(income - expense);
        }