AWS SDK for .NET Documentation
VPCZoneIdentifier Property
AmazonAmazon.AutoScaling.ModelUpdateAutoScalingGroupRequestVPCZoneIdentifier 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. For more information on creating your Auto Scaling group in Amazon VPC by specifying subnets, see Launch Auto Scaling Instances into Amazon VPC in the the Auto Scaling Developer Guide.

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)