help me

CommandHandler.cs

using Discord.Commands;
using Discord.WebSocket;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Reflection;
using System.Threading.Tasks;

namespace DeltaBot
{
    public class CommandHandler
    {
        private DiscordSocketClient _client;
        private CommandService _commands;
        private IServiceProvider _services;
        string token = "no hackerz allowed";

        public CommandHandler(DiscordSocketClient client)
        {

        }
        public async Task StartAsync()
        {
            _client = new DiscordSocketClient();
            _commands = new CommandService();

            _services = new ServiceCollection()
                .AddSingleton(_client)
                .AddSingleton(_commands)
                .BuildServiceProvider();

            await InstallCommandsAsync();
        }

        public async Task InstallCommandsAsync()
        {
            _client.MessageReceived += HandleCommandAsync;

            await _commands.AddModulesAsync(Assembly.GetEntryAssembly());
        }

        private async Task HandleCommandAsync()
        {
            
            var message = messageParam as SocketUserMessage;
            if (message == null) return;

            int argPos = 0;

            if (!(message.HasCharPrefix('&', ref argPos) || message.HasMentionPrefix(_client.CurrentUser, ref argPos))) return;

            var context = new SocketCommandContext(_client, message);

            var result = await _commands.ExecuteAsync(context, argPos, _services);
            if (!result.IsSuccess)
                await context.Channel.SendMessageAsync(result.ErrorReason);
        }
    }
}

Hey, in her _services = new ServiceCollection();
Am I right ?

what