AWS SDK for .NET Documentation
Expected Property
AmazonAmazon.DynamoDBv2.DocumentModelUpdateItemOperationConfigExpected Did this page help you?   Yes   No    Tell us about it...
Document representing the expected state of data in DynamoDB. Note: setting both Expected and ExpectedState is not supported and will result in an exception being thrown. For the operation to succeed, the data in DynamoDB must be equal to the attributes in Expected. If an attribute in Expected is set to null, that attribute must not be preset on the item in DynamoDB.
Declaration Syntax
C#
public Document Expected { get; set; }

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