C# how do make progress bar and timer1 work together?

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C#

c# I need the timer to run while the progressbar is doing its job with some public code, but I'd like to start them together, how do I do that?
the problem is that if I connect them it works but it does one line at a time and sends the completed message to each line. I would like that while the progress bar does its job, time runs second by second until the progressbar operation is finished.
This is the code that progress bar works:

public void righeNere()
      {
          int row_count = dataGridView1.Rows.Count;
          micheleProgressBar1.Maximum = row_count;
          micheleProgressBar1.Step = 1;
          CurrencyManager manager = (CurrencyManager)BindingContext[dataGridView1.DataSource];
          foreach (DataGridViewRow rw in dataGridView1.Rows)
          {
              if (rw.Cells[2].Style.BackColor == Color.White && rw.Cells[3].Style.BackColor == Color.White && rw.Cells[4].Style.BackColor == Color.White
                   && rw.Cells[5].Style.BackColor == Color.White && rw.Cells[6].Style.BackColor == Color.White && rw.Cells[7].Style.BackColor == Color.White)
              {
                  manager.SuspendBinding();
                  rw.Visible = false;
                  manager.ResumeBinding();
                  micheleProgressBar1.PerformStep();
                  MessageBox.Show("Completato", "Messaggio", MessageBoxButtons.OK, MessageBoxIcon.Information);
              }
          }
      }

This is the code that timer2 works:

private void BtnAvvia_Click(object sender, EventArgs e)
        {
            BtnAvvia.Enabled = false;
            BtnFerma.Enabled = true;
            BtnResetta.Enabled = true;
            timer2.Interval = (1000) * (1);
            timer2.Enabled = true;
            timer2.Start();
            startTime = DateTime.Now;
        }
        private void BtnFerma_Click(object sender, EventArgs e)
        {
            BtnFerma.Enabled = false;
            BtnAvvia.Enabled = true;
            BtnResetta.Enabled = true;
            timer2.Stop();
        }
        private void timer2_Tick(object sender, EventArgs e)
        {
            elapsedTime = DateTime.Now - startTime;
            lblContatore.Text = elapsedTime.ToString(@"hh\:mm\:ss\.f");
        }

What I have tried:

private void BtnAvvia_Click(object sender, EventArgs e)
       {
           BtnAvvia.Enabled = false;
           BtnFerma.Enabled = true;
           BtnResetta.Enabled = true;
           timer2.Interval = (1000) * (1);
           timer2.Enabled = true;
           timer2.Start();
           startTime = DateTime.Now;
           righeNere();
       }
       private void BtnFerma_Click(object sender, EventArgs e)
       {
           BtnFerma.Enabled = false;
           BtnAvvia.Enabled = true;
           BtnResetta.Enabled = true;
           timer2.Stop();
       }
       private void timer2_Tick(object sender, EventArgs e)
       {
           elapsedTime = DateTime.Now - startTime;
           lblContatore.Text = elapsedTime.ToString(@"hh\:mm\:ss\.f");
       }
       public void righeNere()
       {
           int row_count = dataGridView1.Rows.Count;
           micheleProgressBar1.Maximum = row_count;
           micheleProgressBar1.Step = 1;
           CurrencyManager manager = (CurrencyManager)BindingContext[dataGridView1.DataSource];
           foreach (DataGridViewRow rw in dataGridView1.Rows)
           {
               if (rw.Cells[2].Style.BackColor == Color.White && rw.Cells[3].Style.BackColor == Color.White && rw.Cells[4].Style.BackColor == Color.White
                    && rw.Cells[5].Style.BackColor == Color.White && rw.Cells[6].Style.BackColor == Color.White && rw.Cells[7].Style.BackColor == Color.White)
               {
                   manager.SuspendBinding();
                   rw.Visible = false;
                   manager.ResumeBinding();
                   micheleProgressBar1.PerformStep();
                   MessageBox.Show("Completato", "Messaggio", MessageBoxButtons.OK, MessageBoxIcon.Information);
               }
           }
       }