using System;

using System.Collections.Generic;

using System.Linq;

using System.Diagnostics;

​

public class CompanyDTO

{

    public int Id { get; set; }

    public string Name { get; set; }

​

    public override bool Equals(object obj)

    {

        if (obj is CompanyDTO other)

        {

            return Id == other.Id && Name == other.Name;

        }

        return false;

    }

​

    public override int GetHashCode()

    {

        return HashCode.Combine(Id, Name);

    }

}

​

public class Program

{

    private static List<CompanyDTO> Sourcels;

    private static List<CompanyDTO> Destinationls;

    private static HashSet<CompanyDTO> SourceSet;

    private static HashSet<CompanyDTO> DestinationSet;

    //this simulate moverbox 

    //change parammeter 

    private static int n_data = 200000;

    private static int n_select = 190000;

    public static void Main(string[] args)

    {

        Sourcels = new List<CompanyDTO>();

        Destinationls = new List<CompanyDTO>();

        InitializeSourceList();

        SourceSet = new HashSet<CompanyDTO>(Sourcels);

        DestinationSet = new HashSet<CompanyDTO>();

        List<CompanyDTO> SelectItem = SelectNItem(n_select);

        // Start the stopwatch to measure the process time

        Stopwatch stopwatch = new Stopwatch();

        stopwatch.Start();

        MoveSourceList2DestinationList(SelectItem);

        stopwatch.Stop();

        Console.WriteLine($"Process_List Time: {stopwatch.ElapsedMilliseconds} ms");

        Console.WriteLine($"Source List: {Sourcels.Count}");

        Console.WriteLine($"Dest List: {Destinationls.Count}");

        Console.WriteLine();

        stopwatch.Reset();

        stopwatch.Start();

        MoveSourceSet2DestinationSet(SelectItem);

        stopwatch.Stop();

        Console.WriteLine($"Process Set Time: {stopwatch.ElapsedMilliseconds} ms");

        Console.WriteLine($"Source Set: {SourceSet.Count}");

        Console.WriteLine($"Dest Set: {DestinationSet.Count}");

    }

    public static void InitializeSourceList()

    {

        for (int i = 1; i <= n_data; i++)

        {

            Sourcels.Add(new CompanyDTO { Id = i, Name = $"Company {i}" });

        }

    }

    public static List<CompanyDTO> SelectNItem(int pSelect)

    {

        return Sourcels.Take(pSelect).ToList();

    }

    //simluate in user select < >

    public static void MoveSourceList2DestinationList(List<CompanyDTO> pSelectedItem)

    {

        foreach (var item in pSelectedItem)

        {

            Sourcels.Remove(item);

            Destinationls.Add(item);

        }

        //fast way if move all 

        //secondList.AddRange(firstList);

        //firstList.Clear();

    }

    public static void MoveSourceSet2DestinationSet(List<CompanyDTO> pSelectedItem)

    {

        foreach (var item in pSelectedItem)

        {

            SourceSet.Remove(item);

            DestinationSet.Add(item);

        }

    }

}