动态改变Theme

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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 Orange : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    void Page_PreInit(object sender, EventArgs e)
    {
        Page.Theme = "Blue";
        //或者是reques过来的参数，或者是从xml文件,数据库中读取..
    }
}