generate a Users log in C #

You can use the code below. It is not very complete but it already fulfills the objective.

namespace LogUtils
{
    using System;
    using System.Collections.Generic;
    using System.IO;
    using System.Threading;

    public class LogWriter
    {
        // cria um modelo de dados para armazenar as informações de log. Como ele só será usado nesta classe pode ser definido dentro dela como interno.
        internal class LogEntry
        {
            public DateTime Date { get; set; }
            public string UserLogin { get; set; }
            public string Message { get; set; }
        }
        // Singleton, usado para acesso as funcionalidade dessa classe. Garante que só exista uma instancia por aplicação.
        private static LogWriter instance;
        public static LogWriter Instance
        {
            get
            {
                if (instance == null)
                    instance = new LogWriter();
                return instance;
            }
        }
        // final da declaração do singleton

        private Queue<LogEntry> LogPool;
        private Thread thread;
        //Armazena a pasta atual da aplicação
        private string path = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase).Replace("file:\", "");

        public LogWriter()
        {
            // Cria a fila de entradas de log
            LogPool = new Queue<LogEntry>();
            // Cria a thread responsável por gravar log no arquivo  
            thread = new Thread(new ThreadStart(WriteOnDisk));

            thread.Start();
        }
        // Tarefa a ser executada pela thread
        private void WriteOnDisk()
        {
            while (true) // executa infinitamente
            {
                if (LogPool.Count > 0) // verfica se existem logs para gravar
                {
                    LogEntry entry = LogPool.Dequeue(); // retira a entrada de log da fila.
                    //Formata o caminho para o armazenamento do arquivo de log
                    string finalPath = Path.Combine(path, "Logs", entry.Date.Year.ToString(), entry.Date.Month.ToString(), entry.Date.Day.ToString() + ".log");
                    //cria a pasta caso ela não exista.
                    if (!Directory.Exists(Path.GetDirectoryName(finalPath)))
                        Directory.CreateDirectory(Path.GetDirectoryName(finalPath));

                    //grava o log
                    using (StreamWriter sw = File.AppendText(finalPath))
                    {
                        sw.WriteLine(string.Format("{0} - {1} - {2}", entry.Date, entry.UserLogin, entry.Message));
                    }
                }
            }
        }

        public void WriteLog(string userLogin, string message)
        {
            //Cria um objeto do tipo LogEntry
            LogEntry entry = new LogEntry { Date = DateTime.Now, UserLogin = userLogin, Message = message };
            //Adiciona entrada na fila
            LogPool.Enqueue(entry);
        }
    }
}

Copy and paste it into a new .cs file. To use it, call the function below right after the execution of your system tasks:

LogUtils.LogWriter.Instance.WriteLog(NOME_USUARIO, MENSAGEM);

Attention, never instantiate this class. Always access it as shown above.

For example:

LogUtils.LogWriter.Instance.WriteLog(login, "O usuário" + login + "alterou o registro);

The class uses a unique thread to manage the log file. This class is for both Windows forms projects, WPF and ASP.NET.

I hope I have helped.

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Create a class, for example Historico .

In it the properties UsuarioAlterou , DataHora , Tela , Observacao .

Create method Salvar()

Whenever you persist an entity, you call this method Salvar()