private async Task ExecuteLoadExpensesAsync()
        {
            IsBusy = true;

            try
            {
                ExpenseList.Clear();

                IList <Expense> list = await _expenseTrackerService.GetExpenseListAsync();

                foreach (Expense e in list)
                {
                    ExpenseList.Add(e);
                }
            }
            catch (Exception ex)
            {
                _telemetry.LogError("ExecuteLoadExpensesAsync error", ex);
            }
            finally
            {
                IsBusy = false;
            }
        }