# System.Net.Quic

``` diff
 namespace System.Net.Quic {
     public sealed class QuicConnection : IAsyncDisposable {
+        public string TargetHostName { get; }
     }
     public enum QuicError {
-        AddressInUse = 4,
+        AlpnInUse = 13,
+        CallbackError = 15,
-        HostUnreachable = 7,
-        InvalidAddress = 5,
-        ProtocolError = 11,
+        TransportError = 14,
     }
     public sealed class QuicException : IOException {
+        public long? TransportErrorCode { get; }
     }
     public sealed class QuicStream : Stream {
+        public override string ToString();
     }
 }
```

