AWS SDK for .NET Documentation
Id Property
AmazonAmazon.S3.ModelCORSRuleId Did this page help you?   Yes   No    Tell us about it...
An optional unique identifier for the rule.
Declaration Syntax
C#
public string Id { get; set; }
Remarks
The ID value can be up to 255 characters long. The IDs help you find a rule in the configuration.

Assembly: AWSSDK (Module: AWSSDK) Version: 1.5.60.0 (1.5.60.0)