using System;

using System.Xml;

​

public class Program

{

    public static void Main()

    {

        Bar(XmlWriter => XmlWriter.Flush());

        Bar(XmlReader => XmlReader.Flush());

    }

​

    private static void Bar(Action<XmlWriter> x)

    {

        Console.WriteLine("W");

    }

​

    private static void Bar(Action<XmlReader> x)

    {

        Console.WriteLine("R");

    }

}