AWS SDK for .NET Documentation
DeviceIndex Property
AmazonAmazon.EC2.ModelInstanceNetworkInterfaceSpecificationDeviceIndex Did this page help you?   Yes   No    Tell us about it...
The device index. Applies to both attaching an existing network interface and when creating a network interface.
Declaration Syntax
C#
public int DeviceIndex { get; set; }
Remarks
Condition: If you are specifying a network interface in the request, you must provide the device index.

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