how to get value of gridview cell

protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        //following will iterate all rows
        foreach (GridViewRow row in GridView1.Rows)
        {
            string value = row.Cells[DesiredcolumnIndex].Text;
        }
        //following will give the value of single row that is being edited
        int i = e.NewEditIndex;
        string value = GridView1.Rows[i].Cells[DesiredcolumnIndex].Text;
    }