Sets the ExternalId property

C# |
[ObsoleteAttribute("The With methods are obsolete and will be removed in version 2 of the AWS SDK for .NET. See http://aws.amazon.com/sdkfornet/#version2 for more information.")] public AssumeRoleRequest WithExternalId( string externalId )

- externalId (String)
- The value to set for the ExternalId property

this instance