public SalaryManagerControl()
        {
            InitializeComponent();

            dataManager   = DataManager.dataManager;
            AllSalaryList = new ObservableCollection <SalaryInfo>();

            (FindResource("YearViewSource") as CollectionViewSource).Source  = AlgorithmClass.GetYearList();
            (FindResource("MonthViewSource") as CollectionViewSource).Source = AlgorithmClass.GetMonthList();

            YearComboBox.SelectedItem  = DateTime.Now.Year;
            MonthComboBox.SelectedItem = DateTime.Now.Month;
        }