asp.net动态加载css

谁如果有更直接的方法，请不吝赐教。也不知道.net有什么方法可以直接更换css

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>红色庄重</title>
    <link href="css/face_red.css" rel="stylesheet" type="text/css" />
    <asp:placeholder runat="server" ID="phCss"></asp:placeholder>
</head>
<body>
    <form id="form1" runat="server">

    </form>
</body>
</html>

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

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
            BindCss();
    }
    private void BindCss()
    {
        HtmlGenericControl objLink = new HtmlGenericControl("LINK");
        objLink.Attributes["rel"] = "stylesheet";
        objLink.Attributes["type"] = "text/css";
        objLink.Attributes["href"] = "css/common.css";
        phCss.Controls.Add(objLink);
    }
}