AWS SDK for .NET Documentation
RunId Property
AmazonAmazon.SimpleWorkflow.ModelSignalExternalWorkflowExecutionInitiatedEventAttributesRunId Did this page help you?   Yes   No    Tell us about it...
The runId of the external workflow execution to send the signal to.

Constraints:

Length
0 - 64

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

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