# System.IO

``` diff
 namespace System.IO {
     public sealed class DirectoryInfo : FileSystemInfo {
-        public override string ToString();

     }
     public static class File {
+        public static void AppendAllBytes(string path, byte[] bytes);
+        public static Task AppendAllBytesAsync(string path, byte[] bytes, CancellationToken cancellationToken = default(CancellationToken));
     }
     public abstract class TextWriter : MarshalByRefObject, IAsyncDisposable, IDisposable {
+        public static TextWriter CreateBroadcasting(params TextWriter[] writers);
     }
 }
```

