public void DataMaintenance(Order anOrder, DB.DBOperation operation)
        {
            int index = 0;

            //perform a given database operation to the dataset in meory;
            orderDB.DataSetChange(anOrder, operation);
            //perform operations on the collection
            switch (operation)
            {
            case DB.DBOperation.Add:
                //*** Add the employee to the Collection
                orders.Add(anOrder);
                break;

            case DB.DBOperation.Edit:
                index         = FindIndex(anOrder);
                orders[index] = anOrder;      // replace employee at this index with the updated employee
                break;
            }
        }