AWS SDK for .NET Documentation
VPCZoneIdentifier Property
AmazonAmazon.AutoScaling.ModelAutoScalingGroupVPCZoneIdentifier Did this page help you?   Yes   No    Tell us about it...
The subnet identifier for the Amazon VPC connection, if applicable. You can specify several subnets in a comma-separated list. When you specify VPCZoneIdentifier with AvailabilityZones, ensure that the subnets' Availability Zones match the values you specify for AvailabilityZones.

Constraints:

Length
1 - 255
Pattern
[\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*

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

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