Detecting System State in C# .Net

Hi,

Once I was asked if there is a way to detect system/workstation state and log the details in a file. So, i came up with the below sample code. I want to give credit to a folk from whom i got the idea about it. I hope it helps you in some way.

 

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using Microsoft.Win32;

namespace DetectWorkstation
{
    class Program
    {
        public void LogSystemLoginDetails()
        {
            SystemEvents.SessionSwitch += new SessionSwitchEventHandler(SystemEvents_SessionSwitch);
        }
        static void Main(string[] args)
        {
            Program p = new Program();
            p.LogSystemLoginDetails();
            Console.ReadLine();
        }
        void SystemEvents_SessionSwitch(object sender, SessionSwitchEventArgs e)
        {
            if (e.Reason == SessionSwitchReason.SessionLock)
            {
                FileStream fs = new FileStream("D:\\SessionLog.txt", FileMode.Append, FileAccess.Write);
                StreamWriter sr = new StreamWriter(fs);
                sr.Write("Locked at: " + System.DateTime.Now.ToLongDateString() + "\t Time: " + System.DateTime.Now.ToLongTimeString() + Environment.NewLine);
                sr.Flush();
                sr.Close();
            }
            if (e.Reason == SessionSwitchReason.SessionUnlock)
            {
                FileStream fs1 = new FileStream("D:\\SessionLog.txt", FileMode.Append, FileAccess.Write);
                StreamWriter sr1 = new StreamWriter(fs1);
                sr1.Write("Unlocked at: " + System.DateTime.Now.ToLongDateString() + "\t Time: " + System.DateTime.Now.ToLongTimeString() + Environment.NewLine);
                sr1.Flush();
                sr1.Close();
            }
        }
    }
}

Please comment your views.
Thanks