using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

public class BaseC

{

    public int x = 55;

    public int y = 22;

}

​

public class DerivedC : BaseC

{

    // Hide field 'x'.

    new public int x = 100;

}

​

public class Program

{

    public static void Main()

    {

        var foo = new DerivedC();

        Console.WriteLine(foo.x);

        var bar = foo as BaseC;

        Console.WriteLine(bar.x);

    }

}