How i can open new form with checkbox

I want to open a new form with checkbox. But this checkbox in datagridview. I can tried but its not working!

foreach (DataGridViewRow r in dataGridView1.Rows)
        {
            if (r.Cells[9].Value != null && (bool)r.Cells[9].Value == true)
            {
                //checked
                MashupFisBilgileri goster = new MashupFisBilgileri();
                goster.Show();
            }
            else if (r.Cells[9].Value == null)
            {
            }
        }