Adding handler to DatagramSocket.MessageReceived results in exception

Question

While experimenting with the new Sockets API I have encountered an error. The following is simplified simple code snippet I used:

 

DatagramSocket socket = new DatagramSocket();
await socket.ConnectAsync("208.67.222.222", "53");
var tcs = new TaskCompletionSource<DatagramSocketMessageReceivedEventArgs>();
socket.MessageReceived += (sender, e) => tcs.SetResult(e);

Now the last line that adds MessageReceived event handler throws a COMException with the helpful text "Unspecified error". Am I doing something wrong or is it possibly a bug (in documentation or my code)?

Answer 1

Apparently it seems to work fine if MessageReceived event handler is registered before calling ConnectAsync, so it's most probably just a documentation problem.