C#

private Thread CheckStatusThread = null;
public delegate void CheckStatusDelegate(int Count);
public CheckStatusDelegate CheckStatusHandler;

public Form1()
{
   InitializeComponent();
   CheckStatusThread = new Thread(new ThreadStart(CheckStatusThreadFunc));
   CheckStatusHandler = new CheckStatusDelegate(CheckPowerStatus);
}
private void Form1_Load(object sender, EventArgs e)
{
   CheckStatusThread.Start();
}   
public void CheckStatusThreadFunc()
{            
   int Cnt = 1;
   while (true)
   {
      this.Invoke(CheckStatusHandler,new object []{Cnt});//executed in Form1's own thread(?)
      Cnt++;
      Thread.Sleep(500);
   }
}

public void CheckPowerStatus(int Count)
{
   int Cnt=Count;            
                            
   //Update 3 controls properties
   StatusBarLabel1.Text = "Checking PowerStatus " + Cnt;                 
   dataGridView1.Rows[2].Cells[4].Value = Cnt;
   label1.Text = Convert.ToString("Cnt "+Cnt);                  
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace mfwmp
{
    public partial class Form1 : Form, IMessageFilter
    {
        public Form1()
        {
            InitializeComponent();
            Application.AddMessageFilter(this);
        }
    }
}
//Error	1	'mfwmp.Form1' does not implement interface member //'System.Windows.Forms.IMessageFilter.PreFilterMessage(ref System.Windows.Forms.Message)'	

public IEnumerable<Guid> GetIds(int count, DateTime time)
        {
            
            Console.WriteLine("Start");
            {
                if (DateTime.Now > time)
                    yield break;
                else
                    yield return Guid.NewGuid();
            }
            Console.WriteLine("End");
        }