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);                  
}