Gets the System.IO.Stream that contains the downloaded item data (buffer).
In most cases, the stream is an HTTP stream and the Stream.CanSeek value will be set to false. Hence, you should read the data from the stream in a forward direction only. Also, do not make any assumptions regarding the stream length as shown in the examples.
For an example, refer to SharePointClient.GetDownloadStream and SharePointClient.GetDownloadStreamAsync.