datagridview 设置单元格自动添加值

String     autoString="自动添加";

 private void dataGridView1_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)
        {
            if (dataGridView1.Rows.Count - 1 >DT.Rows.Count )
            {
                dataGridView1.Rows[dataGridView1.SelectedCells[0].RowIndex].Cells[2].Value = autoString;
            }
          
        }