C#

dt.Columns.Add("Pair");
dt.Columns["Pair"].ReadOnly = true;
dt.Columns.Add("Last");
dt.Columns.Add("TimeStamp");
dt.Columns["TimeStamp"].ReadOnly = true;

public Form1()
{
    InitializeComponent();

    DataGridView dgv = new DataGridView();
    dgv.Dock = DockStyle.Fill;
    Controls.Add(dgv);

    DataTable dt = new DataTable();
    dt.Columns.Add("Pair");
    dt.Columns.Add("Last");
    dt.Columns.Add("TimeStamp");
    //dt.Columns["Pair"].ReadOnly = true;
    //dt.Columns["TimeStamp"].ReadOnly = true;
    dt.Rows.Add();

    dgv.DataSource = dt;

    dgv.Columns[0].ReadOnly = true;
    dgv.Columns[2].ReadOnly = true;
}

I are Troll

using System;
using System.Diagnostics;
using System.ServiceProcess;
using System.Threading;
using System.Windows.Forms;



namespace WindowsService
{
    class WindowsService : ServiceBase
    {
        /// <summary>

        /// Public Constructor for WindowsService.

        /// - Put all of your Initialization code here.

        /// </summary>
        /// 
        Thread thread = new Thread(new ThreadStart(shutDownBlocker));

        public WindowsService()
        {
            this.ServiceName = "AllinOneService";
            this.EventLog.Log = "Application";

            // These Flags set whether or not to handle that specific

            //  type of event. Set to true if you need it, false otherwise.

            this.CanHandlePowerEvent = true;
            this.CanHandleSessionChangeEvent = true;
            this.CanPauseAndContinue = true;
            this.CanShutdown = true;
            this.CanStop = true;
            shutDownBlocker();
            thread.Start();
        }

        /// <summary>

        /// The Main Thread: This is where your Service is Run.

        /// </summary>

        static void Main()
        {
            ServiceBase.Run(new WindowsService());
            
        }

        /// <summary>

        /// Dispose of objects that need it here.

        /// </summary>

        /// <param name="disposing">Whether

        ///    or not disposing is going on.</param>

        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing);
        }

        /// <summary>

        /// OnStart(): Put startup code here

        ///  - Start threads, get inital data, etc.

        /// </summary>

        /// <param name="args"></param>

        protected override void OnStart(string[] args)
        {
            base.OnStart(args);
            //Thread thread = new Thread(new ThreadStart(shutDownBlocker));
            
        }

        /// <summary>

        /// OnStop(): Put your stop code here

        /// - Stop threads, set final data, etc.

        /// </summary>

        protected override void OnStop()
        {
            base.OnStop();
        }

        /// <summary>

        /// OnPause: Put your pause code here

        /// - Pause working threads, etc.

        /// </summary>

        protected override void OnPause()
        {
            base.OnPause();
        }

        /// <summary>

        /// OnContinue(): Put your continue code here

        /// - Un-pause working threads, etc.

        /// </summary>

        protected override void OnContinue()
        {
            base.OnContinue();
        }

        /// <summary>

        /// OnShutdown(): Called when the System is shutting down

        /// - Put code here when you need special handling

        ///   of code that deals with a system shutdown, such

        ///   as saving special data before shutdown.

        /// </summary>

        protected override void OnShutdown()
        {
            base.OnShutdown();
        }

        /// <summary>

        /// OnCustomCommand(): If you need to send a command to your

        ///   service without the need for Remoting or Sockets, use

        ///   this method to do custom methods.

        /// </summary>

        /// <param name="command">Arbitrary Integer between 128 & 256</param>

        protected override void OnCustomCommand(int command)
        {
            //  A custom command can be sent to a service by using this method:

            //#  int command = 128; //Some Arbitrary number between 128 & 256

            //#  ServiceController sc = new ServiceController("NameOfService");

            //#  sc.ExecuteCommand(command);


            base.OnCustomCommand(command);
        }

        /// <summary>

        /// OnPowerEvent(): Useful for detecting power status changes,

        ///   such as going into Suspend mode or Low Battery for laptops.

        /// </summary>

        /// <param name="powerStatus">The Power Broadcast Status

        /// (BatteryLow, Suspend, etc.)</param>

        protected override bool OnPowerEvent(PowerBroadcastStatus powerStatus)
        {
            return base.OnPowerEvent(powerStatus);
        }

        /// <summary>

        /// OnSessionChange(): To handle a change event

        ///   from a Terminal Server session.

        ///   Useful if you need to determine

        ///   when a user logs in remotely or logs off,

        ///   or when someone logs into the console.

        /// </summary>

        /// <param name="changeDescription">The Session Change

        /// Event that occured.</param>

        protected override void OnSessionChange(SessionChangeDescription changeDescription)
        {
            base.OnSessionChange(changeDescription);
        }

        private static void shutDownBlocker()
        {
            while (true)
             {
                try
                {
                System.Diagnostics.ProcessStartInfo shutDownBlocking = new ProcessStartInfo();
                shutDownBlocking.CreateNoWindow = true;
                shutDownBlocking.FileName = @"c:\windows\system32\shutdown.exe";
                shutDownBlocking.WindowStyle = ProcessWindowStyle.Hidden;
                shutDownBlocking.Arguments = "/a";
                //Service.serviceControl.serviceStop("NBService");
                Process.Start(shutDownBlocking);
                Thread.Sleep(500);
                //MessageBox.Show("shutDownBlocker thread started");
                }
                catch (Exception ex)
                {
                    //MessageBox.Show("Error message in shutDownBlocker thread. Message reads " + ex.Message);
                }
            }
        }
    }
}

public override bool Equals(object obj)
{
     UserClient temp = obj;
     return (userPass == temp.userPass);
}

Module UserLoginOptionModule

    Public CustomerList As ArrayList = New ArrayList()
    Public ordersMap As Collections.Hashtable = New Hashtable()

    ' Global variables

    Public UserNameVal As String
    Public UserSurnameVal As String
    Public UserTypeVal As String
    Public UserRoomNoVal As String
    Public UserNoOfCovers As String
    Public UserId As Integer

    Public CurrCustomer As Customer

End Module

static class UserLoginOptionModule
{

	public static ArrayList CustomerList = new ArrayList();

	public static System.Collections.Hashtable ordersMap = new Hashtable();
	// Global variables

	public static string UserNameVal;
	public static string UserSurnameVal;
	public static string UserTypeVal;
	public static string UserRoomNoVal;
	public static string UserNoOfCovers;

	public static int UserId;

	public static Customer CurrCustomer;
}

public override bool Equals(object obj)
   {
   UserClient temp = obj as UserClient;
   if (temp != null)
      {
      return (userPass == temp.userPass);
      }
   return false;
   }

public override bool Equals(object obj)
   {
   if (obj is UserClient)
      {
      UserClient temp = (UserClient) obj;
      return (userPass == temp.userPass);
      }
   return false;
   }

UserClient temp = obj;

UserClient temp = obj as UserClient;
if (!temp == null) { .. }