GetResponseStream() or ReadBytes() who is actually responsible for downloading the data and how?

Question

If we create a HttpWebRequest and get the ResponseStream from its response, then whether the data will get downloaded completely at once or, when we call the ReadBytes of the stream , then only the data will get download from the network and then reads the content?

Code sample which i want to refer is mentioned below:

var webRequest = HttpWebRequest.Create('url of a big file approx 700MB') as HttpWebRequest;
var webResponse = webRequest.GetResponse();
using (BinaryReader ns = new BinaryReader(webResponse.GetResponseStream()))
{
   Thread.Sleep(60000); //Sleep for 60seconds, hope 700MB file get downloaded in 60 seconds
   //At this point whether the response is totally downloaded or will not get downloaded at all
   var buffer = ns.ReadBytes(bufferToRead);
   //Or, in the above statement ReadBytes function is responsible for downloading the content from the internet.
}

Answer 1

GetResponseStream opens and returns a Stream object. The stream object is sourced from the underlying Socket. This Socket is sent data by the network adapter asynchronously. The data just arrives and is buffered. GetResponseStream will block execution until the first data arrives.

ReadByte pulls the data up from the socket layer to c#. This method will block execution until there is a byte avaliable.

Closing the stream prematurely will end the asynchronous transfer (closes the Socket, the sender will be notified of this as their connection will fail) and discard (flush) any buffered data that you have not used yet.