多行表头设计

private void myDg_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if(e.Item.ItemType==ListItemType.Header)
{
TableCellCollection Tcc=e.Item.Cells;
Tcc.Clear();
Tcc.Add(new TableHeaderCell());
Tcc[0].RowSpan=2;
Tcc[0].Text="编号";

Tcc.Add(new TableHeaderCell());
Tcc[1].RowSpan=2;
Tcc[1].Text="CompanyName";

Tcc.Add(new TableHeaderCell());
Tcc[2].ColumnSpan=3;
Tcc[2].Text="地区信息</td><td rowspan='2' >Phone</td><td rowspan='2' >选择</td></tr><tr><td>Addrress</td><td>City</td><td>Country</td>";
}
}