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

        public void RequireOpen() {
            GetStream();
        }

 public static void SetLineNumber(RubyContext/*!*/ context, RubyIO/*!*/ self, [DefaultProtocol]int value) {
     self.RequireOpen();
     self.LineNumber = value;
 }