Use the StreamWriter class to write a text file using C#

A simple example of how to use the StreamWriter class to write a text file using C#.

Code:

using System;
using System.IO;
using System.Threading;

namespace ConsoleApplications
{
    class StreamWriterDemo
    {
        private static string pathFile = "log.txt";

        static void Main(string[] args)
        {
            string logTimestamp = DateTime.Now.ToString();
            string logEvent = "Some events that occurred in the system...";

            WriteLog(logTimestamp, logEvent);
            Console.WriteLine("An event has been posted to the log file");

            Console.WriteLine("We look forward to the next event ....");
            Thread.Sleep(5000);

            logTimestamp = DateTime.Now.ToString();
            WriteLog(logTimestamp, logEvent);
            Console.WriteLine("An event has been posted to the log file");

            Console.WriteLine("We look forward to the next event ....");
            Thread.Sleep(10000);

            logTimestamp = DateTime.Now.ToString();
            WriteLog(logTimestamp, logEvent);
            Console.WriteLine("An event has been posted to the log file");

            Console.WriteLine("We look forward to the next event ....");
            Thread.Sleep(3000);

            logTimestamp = DateTime.Now.ToString();
            WriteLog(logTimestamp, logEvent);
            Console.WriteLine("An event has been posted to the log file");
        }

        /// <summary>
        /// Adds a new line to the log file, adding logTimestamp and logEvent
        /// </summary>
        /// <param name="logTimestamp"></param>
        /// <param name="logEvent"></param>
        /// <returns></returns>
        private static bool WriteLog(string logTimestamp, string logEvent)
        {
            bool result = true;

            FileStream fs = null;
            StreamWriter sw = null;
            try
            {
                fs = File.Open(pathFile, FileMode.Append, FileAccess.Write);
                sw = new StreamWriter(fs);
                sw.Write(logTimestamp + Environment.NewLine + logEvent + Environment.NewLine);
                result = true;
                sw.Close();
                fs.Close();
            }
            catch (Exception excp)
            {
                result = false;
                sw.Close();
                fs.Close();
                Console.WriteLine("Error:" + excp.ToString());
            }
            finally
            {
                result = false;
                sw.Close();
                fs.Close();
            }
            return result;
        }
    }
}

Note: This example is also used Thread.Sleep(x); to pause for x milliseconds running the program.