using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Dictionary<string, string> dictionary = new Dictionary<string, string>()

        {

            { "A", "A" },

            { "B", "B" },

            { "C", "C" },

            { "D", "D" },

        };

        List<string> keys = new List<string>()

        {

            "A",

            "B"

        };

        Console.WriteLine("Dictionary keys: " + string.Join(",", dictionary.Keys));

        Console.WriteLine("List keys: " + string.Join(",", dictionary.Keys));

        Console.WriteLine("Except: " + string.Join(",", dictionary.Keys.Except(keys)));

        Console.WriteLine("Intersect: " + string.Join(",", dictionary.Keys.Intersect(keys)));

        System.Diagnostics.Process proc = System.Diagnostics.Process.GetCurrentProcess();

        Console.WriteLine("Current process: {0}", proc.ToString());

        Console.WriteLine("Private Memory: {0}", proc.PrivateMemorySize64);

        Console.WriteLine("Virtual Memory: {0}", proc.VirtualMemorySize64);

        Console.WriteLine("Working Set: {0}", proc.WorkingSet64);

        Console.WriteLine("Paged Memory: {0}", proc.PagedMemorySize64);

        Console.WriteLine("Paged System Memory: {0}", proc.PagedSystemMemorySize64);

        Console.WriteLine("Non-paged System Memory: {0}", proc.NonpagedSystemMemorySize64);

    }

}