在asp.net 2.0里，可以支持动态访问meta 标记了，比如可以动态增加关键字了
Private Sub CreateMetaTags()

     Dim hm As New HtmlMeta()

    Dim head As HtmlHead = CType(Page.Header, HtmlHead)

    hm.Name = "Keywords"

    hm.Content = "VB.Net, VB.NET, .NET"

    head.Controls.Add(hm)

End Sub