public static DataAccessLayer.ExpenseDetail ToEntity(this Model.ExpenseItem model, Model.Expense expense)
        {
            if (model == null || expense == null)
                return null;

            var expenseItem = new DataAccessLayer.ExpenseDetail
            {
                Id = model.Id,
                Description = model.Description,
                Amount = Convert.ToDecimal(model.Amount),
                ExpenseId = expense.Id
            };

            return expenseItem;
        }