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    <p>You are going to need to use the callback from the NetStream read to handle this. And frankly it might be easier to wrap the copying logic into its own class so that you can maintain the instance of the active Streams. </p> <p>This is how I'd approach it (not tested):</p> <pre><code>public class Assignment1 { public static void NetToFile(NetworkStream net, FileStream file) { var copier = new AsyncStreamCopier(net, file); copier.Start(); } public static void NetToFile_Option2(NetworkStream net, FileStream file) { var completedEvent = new ManualResetEvent(false); // copy as usual but listen for completion var copier = new AsyncStreamCopier(net, file); copier.Completed += (s, e) =&gt; completedEvent.Set(); copier.Start(); completedEvent.WaitOne(); } /// &lt;summary&gt; /// The Async Copier class reads the input Stream Async and writes Synchronously /// &lt;/summary&gt; public class AsyncStreamCopier { public event EventHandler Completed; private readonly Stream input; private readonly Stream output; private byte[] buffer = new byte[4096]; public AsyncStreamCopier(Stream input, Stream output) { this.input = input; this.output = output; } public void Start() { GetNextChunk(); } private void GetNextChunk() { input.BeginRead(buffer, 0, buffer.Length, InputReadComplete, null); } private void InputReadComplete(IAsyncResult ar) { // input read asynchronously completed int bytesRead = input.EndRead(ar); if (bytesRead == 0) { RaiseCompleted(); return; } // write synchronously output.Write(buffer, 0, bytesRead); // get next GetNextChunk(); } private void RaiseCompleted() { if (Completed != null) { Completed(this, EventArgs.Empty); } } } } </code></pre>
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    1. COThank you very much for your reply and sorry for my previous comment. I didn't analyze your reply with the attention it demands. Once I did it, I noticed you're suggesting a "blocking" and a "non-blocking" solution. Unfortunately, your "non-blocking" solutions seems a bit complex, as the exam only asks to implement the "NetToFile" method and the question values 3,5 of 20 total exam points. I really think it must be simpler to solve, without the need to create additional types or expose fields (references to streams and buffer, etc). I'm going to ask for my teacher's help on this.
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    2. COWith your synchronous write - if the output stream is very slow for some reason, could you not miss receiving some of the input while waiting for the output to finish writing?
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