AWS SDK for .NET Documentation
UserData Property
AmazonAmazon.AutoScaling.ModelCreateLaunchConfigurationRequestUserData Did this page help you?   Yes   No    Tell us about it...
The user data to make available to the launched Amazon EC2 instances. For more information about Amazon EC2 user data, see User Data Retrieval in the Amazon Elastic Compute Cloud User Guide.
Note:
At this time, Auto Scaling launch configurations don't support compressed (e.g. zipped) user data files.

Constraints:

Length
0 - 21847
Pattern
[\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*

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

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