IronRuby.Builtins.RubyIO.RequireWritable C# (CSharp) Method

        public void RequireWritable() {
            GetWritableStream();
        }

 public static int WriteNoBlock(RubyIO/*!*/ self, [NotNull]MutableString/*!*/ val) {
     self.RequireWritable();
     int result = -1;
     self.NonBlockingOperation(() => result = Write(self, val), false);
     return result;
 }