/// <summary>
        /// Logs the status of the Expense.
        /// </summary>
        /// <param name="expense">An Expense object.</param>
        private void LogStatus(Expense expense)
        {
            ExpenseLog log = new ExpenseLog();
            log.ExpenseID = expense.ExpenseID;
            log.Status = expense.Status;
            log.DateCreated = DateTime.Now;

            // Persist data.
            ExpenseLogDataAccess dac = new ExpenseLogDataAccess();
            try
            {
                dac.Create(log);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                throw ex;
            }
        }
 /// <summary>
 /// Retrieves a list of Expense Logs belonging to an Expense
 /// </summary>
 /// <param name="expenseID">An ExpenseID.</param>
 /// <returns>A List of Expense Logs.</returns>
 public List<ExpenseLog> ListExpenseLogs(long expenseID)
 {
     // Retrieve data.
     ExpenseLogDataAccess dac = new ExpenseLogDataAccess();
     try
     {
         return dac.SelectByExpenseID(expenseID);
     }
     catch (Exception ex)
     {
         Console.WriteLine(ex.Message);
         throw ex;
     }
 }