Botcode

((First tab))
using Discord;
using Discord.WebSocket;
using System.Threading.Tasks;


namespace IMP
{
    public class Program
    {
        static void Main(string[] args)
        => new Program().StartAsync().GetAwaiter().GetResult();

        private DiscordSocketClient _client;

        private CommandHandler _handler;

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

            new CommandHandler(_client);

            await _client.LoginAsync(TokenType.Bot, "xxxxxxxxxxxx");

           await _client.StartAsync();

           _handler = new CommandHandler(_client);

           await Task.Delay(-1);
        }
    }
}




((Second tab))

using Discord.Commands;
using Discord.WebSocket;
using System.Reflection;
using System.Threading.Tasks;

namespace IMP
{
    public class CommandHandler
    {
        private DiscordSocketClient _client;

        private CommandService _service;

        public CommandHandler(DiscordSocketClient client)
        {
            _client = client;

            _service = new CommandService();

            _service.AddModulesAsync(Assembly.GetEntryAssembly());

            _client.MessageReceived += HandleCommandAsync;

        }

        private async Task HandleCommandAsync(SocketMessage s)
        {
            var msg = s as SocketUserMessage;
            if (msg == null) return;

            var context = new SocketCommandContext(_client, msg);

            int argPos = 0;
            if (msg.HasCharPrefix('/', ref argPos))
            {
                var result = await _service.ExecuteAsync(context, argPos);

                if (!result.IsSuccess && result.Error != CommandError.UnknownCommand)
                {
                    await context.Channel.SendMessageAsync(result.ErrorReason);
                }
            }
        }
    }
}



((Third tab))

using Discord;
using Discord.Commands;
using System.Threading.Tasks;

namespace IMP.Modules
{
    public class Test : ModuleBase<SocketCommandContext>
    {
        [Command("UserID")]
        public async Task Bastard(IGuildUser user)
        {
            await Context.Channel.SendMessageAsync(user.ToString());
        }
    }
}