public static ExpenseItemEntity ToTableEntity(this ExpenseItem model, string expensePartitionKey, string expenseId)
        {
            var expenseItem = new ExpenseItemEntity
            {
                PartitionKey = expensePartitionKey,
                RowKey       = KeyGenerator.ExpenseItemEntityRowKey(expenseId, model.Id),
                Amount       = model.Amount,
                Description  = model.Description,
                HasReceipt   = model.Receipt != null && model.Receipt.LongLength != 0
            };

            return(expenseItem);
        }