AWS SDK for .NET Documentation
UserName Property
AmazonAmazon.IdentityManagement.ModelDeleteAccessKeyRequestUserName Did this page help you?   Yes   No    Tell us about it...
Name of the user whose key you want to delete.

Constraints:

Length
1 - 128
Pattern
[\w+=,.@-]*

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

Assembly: AWSSDK (Module: AWSSDK) Version: 1.5.20.0 (1.5.20.0)