<PackageReference Include="Azure.Storage.Blobs" Version="12.26.0" />

Azure.Storage.Blobs.Models.SequenceNumberAction

public enum SequenceNumberAction
Required if the x-ms-blob-sequence-number header is set for the request. This property applies to page blobs only. This property indicates how the service should modify the blob's sequence number.
namespace Azure.Storage.Blobs.Models { public enum SequenceNumberAction { Max, Update, Increment } }