using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

        public static void Main()

        {

            var list = new List<int> { 1, 2, 3, 4, 5, 6 };

            Console.WriteLine("Process item {t}");

            var filteredList = list

                .Select(

                    t =>

                    {

                        Console.WriteLine("Process item {t}");

​

                        return t * 3;

                    })

                .Where(

                    t =>

                    {

                        if (t % 2 == 0)

                        {

                            Console.WriteLine("Success item {t}");

                            return true;

                        }

​

                        Console.WriteLine("Remove item {t}");

                        return false;

​

                    });

        }

}

​

public class A

    {

        public void Foo()

        {

            Console.WriteLine("Call method Foo() class A");

        }

    }

​

    public class B : A

    {

        public new void Foo()

        {

            Console.WriteLine("Call method Foo() class B");

        }

    }

​

    public class Test

    {

        public static void Main()

        {

            A v1 = new B();

            v1.Foo();

        }

    }