AWS SDK for .NET Documentation
AlarmName Property
AmazonAmazon.CloudWatch.ModelSetAlarmStateRequestAlarmName Did this page help you?   Yes   No    Tell us about it...
The descriptive name for the alarm. This name must be unique within the user's AWS account. The maximum length is 255 characters.

Constraints:

Length
1 - 255

Declaration Syntax
C#
public string AlarmName { get; set; }

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