MafiaTelegramBot/MafiaTelegramBot/Models/Commands/CustomMessageHandlers/ChangeNicknameHandler.cs

using System.Threading.Tasks;
using MafiaTelegramBot.DataBase;
using Telegram.Bot.Types;

namespace MafiaTelegramBot.Models.Commands.CustomMessageHandlers
{
    public class ChangeNicknameHandler : Command
    {
        protected override string Name => "ChangeNicknameHandler";

        protected override async Task<Message> Execute(Update update)
        {
            var newNickname = update.Message.Text;
            var user = await UserDao.GetUserById(UserId);
            await user.UpdateName(newNickname);
            return await Bot.SendWithMarkdown2(ChatId, $"{strings.name_updated} _*{newNickname}*_");
        }
    }
}