How can I add <link rel="canonical" href="http://www.mysite.com" /> to my web page dyanmically.

In the master page there is a <asp:ContentPlaceHolder ID="head" runat="server">
    </asp:ContentPlaceHolder>

thanks.

HtmlLink link = new HtmlLink();
link.Attributes.Add("rel", "canonical");
link.Attributes.Add("href", "http://www.mysite.com");
Form1.Controls.Add(link);

 two methods

http://www.aspdotnetfaq.com/Faq/How-do-I-dynamically-add-CSS-file-for-ASP-NET-ASPX-page.aspx

http://www.codeproject.com/KB/aspnet/setcssfilelink.aspx