AWS SDK for .NET Documentation
NextShardIterator Property
AmazonAmazon.Kinesis.ModelGetRecordsResultNextShardIterator Did this page help you?   Yes   No    Tell us about it...
The next position in the shard from which to start sequentially reading data records. If set to null, the shard has been closed and the requested iterator will not return any more data.

Constraints:

Length
1 - 512

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

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