Insert new row in gridview when no data in gridview

 sql = "select * from tblbkdetails where formid='" + formid + "'";
        ds = SqlHelper.ExecuteDataset(Cnn, CommandType.Text, sql);
        //grdshow.DataSource = ds.Tables[0];
        //grdshow.DataBind();
        if (ds.Tables[0].Rows.Count > 0)
        {
            GridView2.DataSource = ds.Tables[0];
            GridView2.DataBind();
        }
        else
        {

            ds.Tables[0].Rows.Add(ds.Tables[0].NewRow());
            GridView2.DataSource = ds;
            GridView2.DataBind();
            int columncount = GridView2.Rows[0].Cells.Count;
            GridView2.Rows[0].Cells.Clear();
            GridView2.Rows[0].Cells.Add(new TableCell());
            GridView2.Rows[0].Cells[0].ColumnSpan = columncount;
            GridView2.Rows[0].Cells[0].Text = "There is no Records ";

        }