AWS SDK for .NET Documentation
FieldName Property
AmazonAmazon.DataPipeline.ModelSelectorFieldName Did this page help you?   Yes   No    Tell us about it...
The name of the field that the operator will be applied to. The field name is the "key" portion of the field definition in the pipeline definition syntax that is used by the AWS Data Pipeline API. If the field is not set on the object, the condition fails.

Constraints:

Length
0 - 1024
Pattern
[\u0020-\uD7FF\uE000-\uFFFD\uD800\uDC00-\uDBFF\uDFFF\r\n\t]*

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

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