How to pass datagridview values in another datagridview

for (int i = 0; i < dataGridView2.Rows.Count; i++)
       {
           for (int a = 0; a < dataGridView1.Rows.Count; a++)
           {
               dataGridView1.Rows[a].Cells[0].Value = dataGridView2.Rows[i].Cells[0].Value.ToString();
           }
       }