Controls.add c#/asp.net adding controls table/rows/labels

ASPX page must have placeholder

<asp:PlaceHolder ID="DynamicPlaceHolder" runat="server"></asp:PlaceHolder>

codebehind

protected override void OnPreRender(EventArgs e)
{
        HtmlTable mainHtmlTable = new HtmlTable();
        HtmlTableRow helpTableRow = AddLabelRow(mainHtmlTableRow.Cells.Count, "Hello World",true);
        mainHtmlTable.Rows.Add(helpTableRow);
        DynamicPlaceHolder.Controls.Add(mainHtmlTable);
}

public HtmlTableRow AddLabelRow(int cellCount, string text,bool applySkin)
{
    HtmlTableRow helpTableRow = new HtmlTableRow();
    HtmlTableCell helpTableCell = new HtmlTableCell();
    //helpTableCell.Attributes.Add("style", "border: solid 2px; border-color: Blue;");
    helpTableCell.ColSpan = cellCount;

    Label helpLabel = new Label();
    if (applySkin) helpLabel.SkinID = "labelBoldSkin";
    helpLabel.Text = "<br>"+text;

    helpTableCell.Controls.Add(helpLabel);
    helpTableRow.Cells.Add(helpTableCell);
    return helpTableRow;
}

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