// Load RateYear comboBox with Distinct RateYears Values
        private void Load_RateYear_ComboBox()
        {
            lwdom_Rates_Worker RWkr = new lwdom_Rates_Worker();
            List<string> strRY_List = new List<string>();

            strRY_List = RWkr.Get_RateYear_List();
            
            // load combo box
            cboRateYear.ItemsSource = strRY_List;
        }