Bypass datahridview as parameter to function

 public  void Select_all_options_insellGrid(int factor_code,ref DataGridView datagrid)
 {
Factor_sell ff = new Factor_sell();
DataTable dt_check = new DataTable();
DataTable dt_naghd = new DataTable();
DataTable dt_takhfif = new DataTable();
DataTable dt_fish = new DataTable();
dt_check = ff.Select_check_factor(factor_code);
dt_naghd = ff.Select_naghd_factor(factor_code);
dt_naghd.Merge(dt_check,false, MissingSchemaAction.Add);
dt_naghd.AcceptChanges();

 datagrid.DataSource = dt_naghd;
        int p = 0;
            foreach (DataGridViewRow f in dataGridView1.Rows)
            {

         int na = f.Index;
            if (Naghd_radio.Checked == true)
            {
                int j = 1;
                foreach (DataGridViewRow i in datagrid.Rows)
                {
                    int inde = i.Index;
                    datagrid.Rows[inde].Cells[2].Value = Naghd_radio.Text.ToString();
                    datagrid.Rows[inde].Cells[0].ValueType = typeof(string);
                    datagrid.Rows[inde].Cells[2].ValueType = typeof(string);
                    j++;

                } 
            } 
            else if (Check_radio.Checked == true)
            {

                foreach (DataGridViewRow i in dataGridView1.Rows)
                {
                    int inde = i.Index;
                    this.dataGridView1.Rows[inde].Cells[1].Value = Check_radio.Text.ToString();
                    this.dataGridView1.Rows[inde].Cells[0].ValueType = typeof(string);
                    this.dataGridView1.Rows[inde].Cells[1].ValueType = typeof(string);


                }
                    }

                    this.dataGridView1.Rows[na].Cells[0].Value = p.ToString();
                    p++;
                }

          //  datagrid.DataSource = dt_naghd;
            }

 private void button1_Click(object sender, EventArgs e)
 {
  Select_all_options_insellGrid(Convert.ToInt32(factor_num.Text), ref dataGridView1);
}