怎么没显示表头？

[limit_clear]

大家看下，这怎么不显示表头？

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Drawing;

public partial class _Default : System.Web.UI.Page 
{
     

    protected void Page_Load(object sender, EventArgs e)
    {
        TableItemStyle tablestyle = new TableItemStyle();
        tablestyle.HorizontalAlign = HorizontalAlign.Center;
        tablestyle.VerticalAlign = VerticalAlign.Middle;
        tablestyle.Width = Unit.Pixel(100);

        for (int i = 2; i < 10; i++)
        {
            TableRow temprow = new TableRow();
            for (int j = 0; j < 3; j++)
            {
                TableCell tempcell = new TableCell();
                tempcell.Text = "(" + i + "," + j + ")";
                temprow.Cells.Add(tempcell);
            }
            Table1.Rows.Add(temprow);

        }

        foreach (TableRow r in Table1.Rows)
            foreach (TableCell c in r.Cells)
                c.ApplyStyle(tablestyle);

        TableHeaderCell header = new TableHeaderCell();
        header.RowSpan = 1;
        header.ColumnSpan = 3;
        header.Text = "表明（X，Y）值的表格";
        header.Font.Bold = true;
        header.BackColor = Color.Red;
        header.HorizontalAlign = HorizontalAlign.Center;
        header.VerticalAlign = VerticalAlign.Top;

        TableRow headerRow = new TableRow();
        headerRow.Cells.Add(header);

        Table1.Rows.AddAt(0, headerRow);
    }
}

[limit_clear]

?

[shighui]

你都没定义表头嘛。只有默认的表头，是不会显示的！

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[Quote=引用 2 楼 shiguohui000 的回复:]
你都没定义表头嘛。只有默认的表头，是不会显示的！

[/Quote]

TableHeaderCell header = new TableHeaderCell();
//这里不是定义了表头么？