using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO
using System.Text;

namespace ConsoleTemplate
{
    class BatchTemplate
    {
        public static StreamWriter LogWriter = null;

        static int Main(string[] args)
        {
            OpenLog();

            db = DatabaseFactory.CreateDatabase("MyDatabase");
            DbCommand cmd = db.GetStoredProcCommand("MyStoredProcedure");

            WriteToLog( "Hello world!");
            CloseLog();
            return 0;
        }

        static private void OpenLog()
        {
            // Create log folder if it doesn't exist
            string folderPath = Path.Combine(Environment.CurrentDirectory, "Log Files");
            DirectoryInfo logFolder = new DirectoryInfo(folderPath);

            if (!logFolder.Exists)
                logFolder.Create();

            // Clear out old logs
            string appSetting = ConfigurationManager.AppSettings["DaysToStoreLogFiles"];
            int days = int.Parse(appSetting);
            TimeSpan span = new TimeSpan(days, 0, 0, 0);

            foreach(FileInfo logFile in logFolder.GetFiles())
            {
                if (logFile.CreationTime < DateTime.Now - span)
                    logFile.Delete();
            }

            // Create new log file
            string filePath = Path.Combine(folderPath, DateTime.Now.ToString("yyyy-MM-dd-hhmmss"));

            if (File.Exists(filePath + ".txt"))
            {
                bool exitApplication = true;
                for (int x = 1; x <= 10; x++)
                {
                    string newPath = filePath + "(" + x.ToString() + ")";

                    if (!File.Exists(newPath + ".txt"))
                    {
                        filePath = newPath;
                        exitApplication = false;
                        break;
                    }
                }

                // If someone has really launched the batch job more than 10 times in
                // a single second, something is wrong.
                if (exitApplication)
                    Environment.Exit(1);
            }


The App.Config file:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="dataConfiguration"     
             type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings,
           Microsoft.Practices.EnterpriseLibrary.Data,
                   Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
  </configSections> 
  <connectionStrings>
    <add name="MyDatabase"
         connectionString="Data Source=MYDATABASE;Initial Catalog=DEV;User ID=XYZ;Password=12345"
         providerName="System.Data.SqlClient" />
  </connectionStrings>
  <appSettings>
    <add key="DaysToStoreLogFiles" value="60"/>
  </appSettings> 
</configuration>

The batch job shown above creates a log file name 2009-11-28-110817.txt that looks like this:

Begin processing:  2009-11-28-09:08:17

-----------------------------------------------------------



Hello world!



------------------------------------------------------------

Finish processing:  2009-11-28-09:08:18