The handler will be attached to the UploadDirectoryProgressEvent which is fired as data
is uploaded to S3. The handler will be passed information detailing how much data
has been uploaded as well as how much will be uploaded.

C# |
[ObsoleteAttribute("The With methods are obsolete and will be removed in version 2 of the AWS SDK for .NET. See http://aws.amazon.com/sdkfornet/#version2 for more information.")] public TransferUtilityUploadDirectoryRequest WithSubscriber( EventHandler<UploadDirectoryProgressArgs> handler )

- handler (EventHandler<(Of <(<'UploadDirectoryProgressArgs>)>)>)
- A method that is called when UploadDirectoryProgressEvent is fired.

this instance of the TransferUtilityUploadDirectoryRequest