gridView多表头

 private void CreateTitle()
    {
        Table table = (Table)GridView1.Controls[0];
        GridViewRow row = new GridViewRow(0, -1, DataControlRowType.Header, DataControlRowState.Normal);
        TableCell cell1 = new TableCell(); cell1.RowSpan = 2; cell1.Text = "编号";
        TableCell cell2 = new TableCell(); cell2.RowSpan = 2; cell2.Text = "企业名称";
        TableCell cell3 = new TableCell(); cell3.RowSpan = 2; cell3.Text = "法人代表";
        TableCell cell4 = new TableCell(); cell4.ColumnSpan = 2; cell4.Text = "注册监理工程师";
        TableCell cell6 = new TableCell(); cell6.RowSpan = 2; cell6.Text = "资质证书编号";
        TableCell cell7 = new TableCell(); cell7.RowSpan = 2; cell7.Text = "资质等级";
        TableCell cell8 = new TableCell(); cell8.RowSpan = 2; cell8.ColumnSpan = 2; cell8.Text = "编辑";
        row.Cells.Add(cell1);
        row.Cells.Add(cell2);
        row.Cells.Add(cell3);
        row.Cells.Add(cell4);
        row.Cells.Add(cell6);
        row.Cells.Add(cell7);
        row.Cells.Add(cell8);
        row.CssClass = "GridViewHeaderTD";
        table.Rows.Add((TableRow)row);

        GridViewRow row1 = new GridViewRow(1, -1, DataControlRowType.Header, DataControlRowState.Normal);
        TableCell cell11 = new TableCell(); cell11.Text = "一级";
        TableCell cell12 = new TableCell(); cell12.Text = "二级";
        row1.Cells.Add(cell11);
        row1.Cells.Add(cell12);

        row1.CssClass = "GridViewHeaderTD";

        table.Rows.Add((TableRow)row1);
    }

 protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.Header)
        {
            CreateTitle();

            e.Row.Visible = false;
           
            
        }
   }